https://forum.colemak.com/viewtopic.php?id=188

Most of your questions are answered in that topic.

Many wouldn't do anything and just type blind. It works well, but there's a certain satisfaction to having the right layout in front of you too - plus it helps with password entry.

Firstly, you need to know that your keyboard can be customized at all! Some keys are interchangeable, some aren't and while laptop keys are often interchangeable it'll require inquiry. You could pry off a keycap or two very gently, taking great care to pull evenly on all sides if possible (and/or use a cap puller) and not breaking off any minute plastic parts. That done, note whether the different rows have different stems, and whether the F and J keys in particular are any different from the others.

I wouldn't worry about the bump on the F key if I were you. I home well with the bump in the new Colemak position, no problem. The right hand is worse. On the board I'm typing on right now, I took a NumPad 5 key with a bump on it for the Colemak N! But most laptops don't have those...

Hooleon has stickers, including homing nub stickers (see the link above). But as Liquid_Turbo says, you might get far with a dab or glue (or my knife method) too.

Don't use a keycap puller on a scissor switch (laptop key), and don't pry from all sides! You will break something. There are several different kinds of scissor switch but most snap into pins at the top of the key and are held by hooks at the bottom. If you pry from the bottom, you will break the hooks. Instead, pry from one top corner till you hear a click, then pry the other top corner. With the top pried away from the pin, the rest of the key will be loose and can simply be picked up.

Desktop keyboards are different and yes, use a key puller or something to pry at all sides at once.