I thought several times about building a bitcoin wallet but I'm just too worried that I'll get something wrong and either lose a key or accidentally make a tran

I thought several times about building a bitcoin wallet but I'm just too worried that I'll get something wrong and either lose a key or accidentally make a transaction that loses coins so decided not to risk it even for my own use. I'd frankly be terrified to let anyone else risk their own money on something like that without extreme levels of code review etc.