Cheapest Phone Technician to swap motherboard ? Even mail order ?

I got stung on [Adverts] with a phone which is blacklisted but at least thankfully not stolen [check my previous profile posts for further information if curious]. My old phone was an identical model but with a broken screen. Someone mentioned to me that one way out of this pickle would be to simply swap motherboards. I easily found out how to disassemble the phone and put it back together on YouTube but I'm wary about this as a first timer with none of those specialist micro tools or a hot air gun to loosen the screen. Plus I have large hands , not tiny surgical hands.

Does anyone recommend a place to go within Dublin or accessible via car? Maybe theres a mail order business which is cheaper or even somewhere across the border ? It all depends on the bottom line economics. If theres a phone technician out there willing to do the job then send me a message.

Im suffering serious phone withdrawal symptoms and its only been 48 hours