Hey it’s up to you, if you have no manual dexterity, then maybe an old car like the 40 isn’t the right fit - they go wrong - often.
Most of us have fixed them ourselves, mainly because modern mechanics are too young to understand technology that existed when these cars were designed. Jaguar mechanics that were familiar with them are mainly nearing or have already retired.
These cars can’t be plugged in to analyzers, so that eliminates a lot of shops right off the bat.
If you do decide to have a go at DIY, there is a veritable mountain of help right here on these pages. Almost everything that could go wrong with these old cars has probably been attended to by now, so there’s lots of advice and how-to’s in the archive. We all had to begin somewhere - personally, I knew nothing about the XJ40 when I bought mine.
Having some college degrees and IT qualifications will cut no mustard if you can’t use a socket set. I too have a fair amount of computer experience, as do many of our members. I once wrote a CAD packaging program (what you would call an “app”) that took three years to complete …however, it was no help to me when I recently changed the harmonic balancer on my '40.