It was mentioned in the tools and materials list that your PVC pipe should be cut to the length of your window but if you haven't done that yet, please do so before we can proceed.

The first step (after cutting your pipe to length) is to mark a line straight down the length of the pipe using a pencil. Every 10-15cm, or so, on that line make a little circle mark with your pencil. These will be the places where your vines will go so if you have more vines, mark more spots and if you have less, then mark less. This will be the underside of your curtain.

At each place where you marked, drill a pilot hole using your smallest drill bit.

Drill each of those holes again with a drill bit which is just slightly larger than the diameter of your vines.

Move on to the next step.