We have a Fiesta and we managed to push it around but it was always a struggle, we keep it in a lock up garage too and it only just goes through the doors with about 2" on each side.
So we decided to go for a Motor Mover (Autofix come out and fit it at your home) best thing we ever bought for the FC, inch perfect so you can move it exactly where you want it, no struggling on wavy grass sites. The drive to our garage is about 50 metres long and very uneven and it copes fine without running the battery down much.
Go for a Mover if you can, it's well worth it in our opinion...
We have a 2005 Pullman I think it's 750kg, I'm 35 and 'reasonably' fit, if on a flat surface, I can manoeuvre the Pullman easily. But any other surface or slope and it becomes very difficult, I do wonder how much pushing and pulling those plastic handles can take! Luckily my garage is down hill (slight) so it's not much of an issue parking it, and I simply hitch up and drive away when using it. So in my opinion a motor mover is the only option if your garage is up hill. On a side note, Terry at Camping int is a top bloke, I bought my camper off him and he's helped me no end with any issue I've had, I would always go back to him.
It's all s**ts and giggles until someone giggles and s**ts!