I couldn't find anyone to do my Mariko normal switch in the UK, I am pretty proficient at soldering and had the right tools but it is an horrific install, them 2 SP points are so tiny even under a microscope. I have done plenty of refurb and mod work on every console up to the 360 without issue, but this machine was a whole new level when it came to precision.
I did do it and tbf it worked first time, but it is not a machine to experiment on as those 2 points on the CPU and the components around them are not forgiving it you push one of them off by accident. Multimeter, smallest soldering iron bit and a microscope are your best friend.