Unless you are going to fulltime then it is just a hobby, a frippery.
Only spend what you know you can comfortably spend again in case of unexpected mishaps.
Engines are not cheap.
I was lucky in buying a van for nearly half market value, (£10k) only for engine to blow 6 months later.
I personally got a house seller £40k more than asking price last weekend by simply bigging up the sale......(I work for an estate agent).
I will get not a penny nor a thank you as I get paid per hour rather than commission.