When you're doing something for the first time, it pays to take your time with it. If you try your hardest at new things, you know you've given it your best, so if it fails, you know it's not because you didn't try. The worst thing you can do is to not try and then fail, because all you're left with is 'what if I had tried more'. I've half-assed jobs before when I was still a beginner at it, and that was a recipe for disaster. It was so bad I didn't go back to it for a long time, which stalled my progress dramatically. Try your best at new things, and even go out of your way to make sure you have done your best so that you're not left with regret, and instead there's a higher chance you'll be left with possibilities.