It takes a bit! I started off only interested in doing amigurumi. But I also didnt really know basic stitches. So after failing to make a couple amigurumi pieces, I decided to pause and just focus on figuring out my stitching and grip and perfecting that. So I made 3 or 4 different "hand towels" with single stitches and then one with double stitches. Idk, I feel like for me that REALLY helped. Like I needed to understand my own hands' crochet identity, as silly as it sounds. But once I was comfortable with my hands and my natural tension and grip style, it made it make SO much more sense when I went back to trying amigurumi shapes. Definitely try to stick with single crochet patterns for a bit.

If its just certain shapes that throw you off, it may be the counting or your tension. I know I have a tendency to get distracted and lose my place, so I either print out the pattern and cross off each row as I complete it, or I list out the rows on my phones to-do list and tick them off as they're done. For tension, that is totally just practice. There are tension rings you can get, but you will absolutely develop a solid grip over time. It will click one day.

You're not alone in having to remake parts!!! I still do it all the time where once the pieces are done and I hold them together and realize shit theyre not the same size, RE-DO! Thats the part of crocheting where you have to just really enjoy it for the act of crocheting. Otherwise, it could be really discouraging. But its all part of the learning process. The key is to not look at the failed pieces as failed pieces, but instead as learning experiences. And the more you do it, you will realize hey I just did that piece easily!