though I would like to be able to do stuff like a basic oil change etc without paying a fortune for it to be done.
A complete 50hr check is within pilot privileges on a CofA aircraft - both G-reg and N-reg.
Doing your own 50hr checks represents a large operating cost saving. I spend about £70 on the oil, £15 on the oil filter, and that's about it. I would be paying £600+ for a company to do it.