Comrade, I'm going to assume you're young. I'm not. But I can tell you as the handiest person I know, I got here because I never stop fucking around with things over the years. Some of my tools have chunks melted out of them from accidentally shorting a car battery. I've skinned my knuckles, stabbed, electrocuted, burnt, cut, glued, bumped, and bruised myself, and I expect I'll do it again some day but hopefully less often. The difference between us is time spent being stubborn about wanting to know how things work and a lot of times needing to save money. Don't get down on yourself, you changed your battery and that's more than many people will do.
Keep fiddling with things, you'll get there. But also, take your time to think through hazards, it makes it a lot easier. Don't ever rush handy/repair/maintenance work.