RaeK, I also bought my bike "pre-loved" from a good owner. You can get some very nice bikes that way; lots of people buy bikes and then stop using them after a little while. My first suggestion for you is to get to know your bike, by that I mean, the parts and what they do. I found that making the bike all pretty and shiny made me happy and let me touch every component. Get yourself a little car wax and maybe some metal polish and some rags. Clean and polish one component per day (one wheel rim, the cranks, the rear triangle, seat tube, etc.). Look it over for any cracks or chips. Clear nail polish works great to protect the frame if it has scratched paint. At the same time, either read a maintenance book or watch a you tube video on how to service that particular part. You may not ever do it, you may not have the tools or the time or the desire, but you will be able to communicate in a bike shop if needed. Do get yourself a basic set of hex keys so you can check bolt tightness while you clean. Buy some lube and keep the chain in good shape. And just ride. As for lifting it, you may find it is easier to carry when it is NOT folded as long as you find the balance point, then fold when you get upstairs. Congrats!!!