Originally Posted by carleton

Also, I'm just being argumentative here...

But, we are also forgetting about liability. What if he mis-threads and cross threads his BB shell or bends a headset cup. This stuff happens every day. He is pretty much SOL if he does it. But the bike shop would have to take it on the chin and pay for replacements. I used to work at a few shops. I know how often it can happen...even by professionals.

Need a bike stand to do all of this?

Hey, I'm all about DIY. Sh*t I started the DIY thread. But there comes a time when you have to compare the cost (time, money, effort, education) to the benefits (headset and BB installed) and determine if it's worth it.