From what I can remember you get in via the grill at the front. Tease it off and get your arm up - you'll get loads of fibreglass scratches and you won't be able to see what you're doing. Have fun. FFG
Its troo, I did mine a couple of weeks back. Also depends what year Chim you have as the more recent ones had openings in the wheel arches so u just need to take the wheels off! Either way its a chore! Plenty of threads on here about this too.
I change dthe radiator on the Groff at the weekend and that was a chore. I'd swap with you anyday. Most jobs seem easier on the Chim than on the Griff. FFG
Unless you have a later car. Split front grill? Then you remove the wheel on the offending side and there is a hatch in the wheel arch that you remove to gain access. Remember the sealent when you put the cover back on.