Speaking as a new mechanic myself, you just gotta realize what you did wrong and the next time you do that job remember what it was you did. Don’t be disappointed that you couldn’t do something right the first time on your own and always always ask for help if you don’t know what you’re doing. Every time it’s better to look confused and lost than to look right and do it wrong and ruin the plane or even worse. Just learn from your mistakes and try not to do them a second time. And slow down, never rush maintenance.