Cuts?

Try a jewelers saw. It looks like one of those cheap hobby hacksaws, but the blade is thin... it needs the frame for tension cause even a fragment in an X-acto bends. If youjust want to add the look, use a hobby hacksaw blade and drag it up and doen the cut edge a few times like a file. If you don't own a hacksaw, look in the Dollar store for cheap hobby ones, or even just the blades, cause ya can stuff 'em, into X-axto knife handles (can post a pic if you like)

For softening the plastic to bend it, make a narrowing duct out of foil that looks like the fine suction nozzle on a vacuum (pie plate foil is perfect) With fine output, you can direct the heat where ya want it without actual contact. Test it out on a scrap or two first, as you may not need to be as close as you think. Empty soda-pop bottles make great test material.

WARNING: this 'duct' MAY overheat the dryer fast, so make the duct removable and use an old winter glove or oven mit cause it'll me HOT, or better yet make sure your dryer has a blow with low/no heat setting to cool the elements. I have both a cheap dryer and a proper heat gun, and use whichever depending on my needs.