Camshaft change in '92 mini

[vrooom]

My mini has a circle hole in my inner wing. for fan, not those slotted grillie. and i got all parts ready. can i change it while the engine is in the car? or will there be lots lots of swearing to be done.

If not. how much i am looking to pay, when i got camshaft + bits. to garage to fit it in for me.

Jay