I am not new to biking, but I am new to advanced bicycle mechanics. I have done minor repairs. I have a very well used 1992 Trek 700 hybrid. Besides repacing the tires, seat, and cables, that I can do: on this bike I will need to replace the bottom bracket(don't even know what bottom bracket to order), sounds like a pepper mill grinding. Moreover, I think that have to replace the the rear hub and some broken spokes. Besides the minor repairs, the major repairs at a bike shop would cost more than the bike is worth. Would appreciate any suggestions.