When I asked my LBS to check out my bottom bracket (it was making noises) they actually offered to show me how to take it out, clean it and re-grease it so that "I could do it myself next time". When I watched the mech working, I noted it took some special tools to remove the BB. He said no problem, only two special tools needed, and showed me which tools I would need to get.
When the job was done he only charged me $10. I'm not sure I would be able to do what he did, but it was still quite educational to watch him work. Being a computer tech I knew to keep a certain distance and not bother him while working.
Sverre