diff --git a/README.md b/README.md
new file mode 100644
index 0000000..c431cb9
--- /dev/null
+++ b/README.md
@@ -0,0 +1,13 @@
+# VMs
+
+## HOW-TO
+To start (or create) a VM, go in the desired folder and run 
+```console
+$ ./run.sh
+```
+
+## USB Passthrough
+
+If you need USB passthrough, uncomment and fill in the corresponding line in
+`run.sh`.
+[You may need root privileges](https://wiki.archlinux.org/title/QEMU#Pass-through_host_USB_device).
diff --git a/arch/create.sh b/arch/create.sh
deleted file mode 100755
index c375e23..0000000
--- a/arch/create.sh
+++ /dev/null
@@ -1,18 +0,0 @@
-#!/bin/bash -e
-cd "$(dirname "$0")"
-. ./lib.sh
-
-if [ -f hda.qcow2 ]; then
-    echo -e "Disk file exists. Are you sure you don't want" \
-        "\e[1m\e[31m./run.sh\e[0m?\nCtrl-C to interrupt" >&2
-    read -r
-fi
-
-qemu-img create -f qcow2 hda.qcow2 10G
-
-CMD=(
-    "${CMD[@]}"
-    -drive file=arch.iso,index=1,media=cdrom,readonly=on
-)
-
-"${CMD[@]}"
diff --git a/arch/download_isos.sh b/arch/download_isos.sh
deleted file mode 100755
index 39df8b8..0000000
--- a/arch/download_isos.sh
+++ /dev/null
@@ -1,6 +0,0 @@
-#!/bin/bash -e
-
-arch=''
-
-curl -LC- \
-    -o arch.iso "$arch"
diff --git a/arch/lib.sh b/arch/lib.sh
deleted file mode 100644
index a320ecd..0000000
--- a/arch/lib.sh
+++ /dev/null
@@ -1,23 +0,0 @@
-#!/bin/bash -e
-
-RAM="$(free -g | awk '/^Mem:/{print $2 - 2}')"
-
-if   [ "$RAM" -le  2 ]; then  RAM=2
-elif [ "$RAM" -gt 32 ]; then RAM=32; fi
-
-RAM="${RAM}G"
-
-CMD=(
-    qemu-system-x86_64
-        -accel kvm
-        -M q35
-        # usb
-        -device qemu-xhci
-        -cpu host
-        -m "2G,maxmem=$RAM"
-        -vga virtio
-        #-drive if=virtio,file=hda.qcow2
-        # shared memory
-        -object memory-backend-ram,id=mem,size=2G,share=on
-        -numa node,memdev=mem
-)
diff --git a/arch/run.sh b/arch/run.sh
index c2c066e..02427cc 100755
--- a/arch/run.sh
+++ b/arch/run.sh
@@ -1,12 +1,20 @@
 #!/bin/bash -e
 cd "$(dirname "$0")"
-. ./lib.sh
+. ../lib.sh
+
+hda='https://geo.mirror.pkgbuild.com/images/latest/Arch-Linux-x86_64-basic.qcow2'
+
+if ! [ -f hda.qcow2 ]; then
+    ask_yn "hda does not exist. Download?" \
+        && curl -LC- -o hda.qcow2 "$hda"   \
+        || exit 1
+fi
 
 CMD=(
     "${CMD[@]}"
     -nic user,model=virtio-net-pci
-    # usb passthrough, might need root privileges
-    #-device usb-host,vendorid=0x058f,productid=0x6387
+    # USB passthrough, might need root privileges
+    #-device usb-host,vendorid=0xffff,productid=0xffff
 )
 
 "${CMD[@]}"
diff --git a/win2k22/lib.sh b/lib.sh
similarity index 74%
rename from win2k22/lib.sh
rename to lib.sh
index d9029e4..aa25d42 100644
--- a/win2k22/lib.sh
+++ b/lib.sh
@@ -1,5 +1,16 @@
 #!/bin/bash -e
 
+function ask_yn() {
+    local ans
+
+    printf "$1 (Y/n) " >&2
+    read -r ans
+    case "${ans,,}" in
+        y*|'') return 0 ;;
+        *)     return 1 ;;
+    esac
+}
+
 RAM="$(free -g | awk '/^Mem:/{print $2 - 2}')"
 
 if   [ "$RAM" -le  2 ]; then  RAM=2
@@ -11,12 +22,12 @@ CMD=(
     qemu-system-x86_64
         -accel kvm
         -M q35
-        # usb
-        -device qemu-xhci
         -cpu host
         -m "2G,maxmem=$RAM"
         -vga virtio
         -drive if=virtio,file=hda.qcow2
+        # usb
+        -device qemu-xhci
         # shared memory
         -object memory-backend-ram,id=mem,size=2G,share=on
         -numa node,memdev=mem
diff --git a/win2k22/create.sh b/win2k22/create.sh
old mode 100755
new mode 100644
index def5788..44afe2b
--- a/win2k22/create.sh
+++ b/win2k22/create.sh
@@ -1,20 +1,19 @@
 #!/bin/bash -e
 cd "$(dirname "$0")"
-. ./lib.sh
+. ../lib.sh
 
-if [ -f hda.qcow2 ]; then
-    echo -e "Disk file exists. Are you sure you don't want" \
-        "\e[1m\e[31m./run.sh\e[0m?\nCtrl-C to interrupt" >&2
-    read -r
+if ! [ -f win2k22.iso ] || ! [ -f virtio.iso ]; then
+    ask_yn "win2k22.iso and/or virtio.iso not found, download?" \
+        && bash ./download_isos.sh                              \
+        || exit 1
 fi
 
 qemu-img create -f qcow2 hda.qcow2 40G
 
 CMD=(
     "${CMD[@]}"
-    -drive file=win2k22.iso,index=1,media=cdrom,readonly=on
-    -drive  file=virtio.iso,index=2,media=cdrom,readonly=on
-    #-drive file.driver=http,file.filename=http://example.com/image.qcow2
+    -drive file=win2k22.iso,media=cdrom,readonly=on
+    -drive  file=virtio.iso,media=cdrom,readonly=on
     -nic none # you don't want internet access for a windows installation
 )
 
diff --git a/win2k22/run.sh b/win2k22/run.sh
index e40b804..1993875 100755
--- a/win2k22/run.sh
+++ b/win2k22/run.sh
@@ -1,12 +1,18 @@
 #!/bin/bash -e
 cd "$(dirname "$0")"
-. ./lib.sh
+. ../lib.sh
+
+if ! [ -f hda.qcow2 ]; then
+    ask_yn "hda.qcow2 not found, create?" \
+        && bash ./create.sh               \
+        || exit 1
+fi
 
 CMD=(
     "${CMD[@]}"
     -nic user,model=virtio-net-pci
-    # usb passthrough, might need root privileges
-    -device usb-host,vendorid=0x058f,productid=0x6387
+    # USB passthrough, might need root privileges
+    #-device usb-host,vendorid=0xffff,productid=0xffff
 )
 
 "${CMD[@]}"