How do you know that you have the right kind of scissors for self trimming? I assume that you can just buy the fancy scissors from Sally's...
Also, how do you know they are sharp enough? Better yet, how do you know when they AREN'T? Is it true that if they aren't sharp enough, you can create weak ends (that will eventually split) as you cut?
3c-like S-waves and random curls
Fine density; medium & fine strands
Naturally very dry and very frizzy
Yes, you can get a nice pair at Sally's. You don't have to spend a lot, just make sure they "feel" good in your hand. You can handle them easily and manuever them. As for being sharp, you can use a regular knife sharpener. If they are new, you should be good. I always sharpen mine after each use. Either way you want them to be VERY sharp. Sharp enough to slice skin, so be careful.