I started out by replacing a rim. It was easier than I thought, just tedious and time consuming. I really think the worst you could do is round a nipple or two. Make sure you have a few spare nipples. Also lube the spokes and nipples well. Just be patient. Build up some tension, Try to keep it even, true the wheels laterally and radially. Get proper dish. Finish trueing it. Get it to a reasonable tension, I found out I was seriously overtensioning my wheels when I bough a tensiometer I was as high as 150 kgf. Finally stress relieve and don't be surprised if it goes out of true during the frist ride due to spokes unwinding. Just retrue it.