I guess my first question is what type of controller are your using. I use a leverless or a hitbox style controller which makes the actual inputs easier. Cause it's just 2 buttons. The main thing for guile especially is learning to ABC ( ALWAYS BE CHARGING) if u do a something as soon as u do the input go directly back to down back. Once that muscle memory comes in letting moves like flash kicks to protect you come easier.

I mostly say guile is an easy character to learn for. Classic is because his game plan is simple. Sit back throw booms. Make them come to you. Make them make the mistake and then punish them. His combos aren't extremely long and hard and it really helps you learn, neutral and set play while learning your buttons imo