My tranny gave up the ghost at 100,000 miles. Put about 250 miles on it after loosing 3rd and 5th gears, by the time I got home 2nd was making all kinds of unpleasant noises. Ended up spending about 1,100 in parts and about $420 in labor to fix. For $420 I'll let an expert fix it. Not worth it to me in time, research and fabricating tools to do myself and I lilke working on bikes, cars etc. I don't need excuses to buy tools.
Not to mention a guarantee on workmanship.