I just can't figure out how to do hills. I know they are coming up. So do I wait until I need to change gears then do a gear change, or do I anticipate the need for a gear change? Also, people pass me like crazy. What am I doing wrong? I know about the packs of men who are drafting off each other, but it's the others. I seem to be working way too hard. I need to find a way to make the bike do all the work, but I just can't seem to figure it out and I'm getting frustrated.