I'd bet with your experience on the 22RE you would find the job not overly difficult, just more time consuming.
Guess you will have to decide if the the learning expereince and cost savings would be worth it in the long run.
I'd bet you could add some upgrades like headers and still be well ahead money wise if you do it yourself. I managed, and the HG replacement was was frist voyage into "major" engine work.
YotaTech really helped me out and is probably the best tool to have should you decide to give it a go... plus a factory manual.