I bought a pulley system to lift my hardtop off the car. It screws into a joist in the garage ceiling. Makes it pretty much a one-man job, and stores the top hanging from the ceiling during the summer. If you like, I can take a picture of it.
The hardtop itself weighs about 70 lbs, so it's not bad to lift. It's just bulky.
2001 M3 Convertible, Carbon Black - Daily Driver
2007 328i Convertible, Atlantic Blue - Wife's car
2003 X5 4.4i - Grocery-getter