My seat goes on without any problems. You just need to take your time and make sure of a few things:
1. All wires, cables and other obstructions are clear.
2. Remove the passenger backrest-It's only two screws accessed in the trunk and makes it easier to replace the seat.
3. Use something (duct tape, silicone, gorilla glue, etc) to secure the rubber grommets onto the seat pan so they don't fall off.
4. When replacing the seat, make sure the tab in front fits into the slot.
5. Sometimes it helps to have someone sit on the passenger seat to get the holes lined up.
6. Get one bolt started but don't tighten any of them until all 4 are started.