I have a Specialized Sirrus that is about 5 years old that I am planning putting an ebike kit on. I live in Baltimore and use the bike around town, as well as on some light mountain trails. I think I'm going with a BB02 Kit with a 48v battery and 46t sprocket that I was planning on getting from Luna Cycle. I plan on pedaling most of the time, and am not that interested in a throttle, but will use it until I figure out how I'll truly be using the bike. The main issue I'm having is that I get older, 51, I 'm finding hills harder on my joints and would like a little assistance. I don't usually go more that 15-20 miles at a time and I'm not trying to increase my overall speed that much. I'm decent at wrenching, and do most of my own fixes. Is there anything I should watch out for or should I just pull the trigger and get it going? I'm a little worried about messing with the bottom bracket but feel like a mid drive is the most natural; that being said I'm open to a rear hub motor. I appreciate any feedback.