If you have a valuable car, and you’re considering paying to have it done or doing it yourself, consider a few things:
I would get a proper engineered solution done by someone experienced, INSURED before I let a ‘good guy’ do it in his backyard. Consider someone who supports this forum if you do outsource it.
If it goes wrong, you maybe need legal and insurance recourse.
It’s unlikely that any substantial shop will want to take it on if you start it yourself and find it more than you were going to chew off. That might leave you stuck.
A regular shop will likely get it done and have you on the road in a much shorter period than a DIY job, and it’s likely going to be a better job. How many drives do you have to do at $100/drive before 6-12 months of driving time starts to make sense.
In saying this - and I have no axe to grind either way because my ‘69 resto has been going on since 2002 - doing it yourself does give you a lot of satisfaction.