It's not hard at all, trust me! I'm also lousy with tech and was scared to mess thing up in my computer the first time, but just a quick google search on how to clean your browser data is more than enough. It's just a couple of click and that's it, there no need to use programs or move files around.
I hope this is helpful tho im sorry if i'm being pushy. I completely understand the fear of messing something, I hope you find out a solutoon eventually!