What are your thoughts on Contrast? I wanted to paint Dark Angels using contrast because I like the final effect more than with normal layer paints but Contrast seems like a trap. I've been watching some tutorials and I'm concerned.

There are a lot of rules to using Contrast like not leaving the surface till you fill it out, don't touch it before it dries, move from corner to corner, don't stop on flat surfaces etc. etc.
Thing is... what do I do when I fuck up during edge highlighting? Because I 100% will. Paint it up again with Grey Seer and use 2 different Contrast Paints to get back to the main color but will it look different? Will it fuck up the finish? Will it be noticeable?
I'm worried here that I'm falling into a trap if I commit to Contrast. This Warhipster dude makes it look so easy and calming but he doesn't make mistakes. I don't want to be a slopper.

Should I just use normal layer paints and leave Contrast for effects?