Hi, Robert and welcome to the forum!
My take on PE:
1. Take the fret of PE parts and place it on a FIRM surface. I like to use a metal plate...
2. Using a good chisel-tip X-acto blade, or other suitable alternative, separate the part from the fret. You might want to consider taping the part down, or using firm finger pressure to prevent launching the part as it is cut from its mount.
3. Once cut, use some sandpaper or a file to remove the excess fret material from the part.
4. If the part needs to be bent or shaped, first heat it briefly until it glows red (just a couple seconds or it will melt!!). This anneals the part, and makes it easier to bend. Using a razor blade or other straight edge, place it along the bend line and use another razor blade to slip under the part to be bent, and bend upwards until the correct angle is reached. For circular parts, they can be formed around wooden dowels, nails, etc.
5. Once shaped, position the part on the model to ensure a good fit. Some PE parts require you to remove pre-existing plastic parts first.
6. Consideration should be given to removing paint prior to attaching PE. However, if the part is small and will not support significant weight, it can be attached directly to painted surfaces.
7. Use cyanoacrylate to glue the part to the model. I like to use Zap-a-Gap, personally, as the super glue of choice. Some modelers will use white glue to pre-position or even final glue a part.
8. Once applied and in place, you can paint as you choose. If you are going to apply a gloss paint to the piece, prime first...
These are some basics. Hope this helps.
Gip Winecoff