I recently tried lining up my putts by drawing a line on my ball and lining it up. The problem is, I have a lot of trouble lining it up straight. Does anyone have tips for doing this? Also, I have a lot of trouble lining up the ball when it's on a slope. A lot of times, I'll place it and it'll budge slightly because of the slope. I've actually given up already but if anyone has some tips, I'd be happy to hear them.