My advice is to read up a little on using the navball. Then go into sandbox where it's free and doesn't affect your game. Build something simple, open the cheat menu for infinite fuel (optional but it's one less thing to worry about) and go to space and play around. You can watch video's all day but until you actually play around with it, it seems harder than it is. I messed around for about 2 hours like that one night and I can now easily get any orbit asked for in very few moves and can grab something in space with the claw pretty quick. Lining up docking ports is still a little tough for me but I think that's more muscle memory than anything.