I recognize the risk and take the chance - accomplished a lot of things in my garage I never dreamed I could do. Yeah I've saved quite a bit over the years, but one extra hit like the one I just took also makes me wonder. There's been times when I install something - stand back and say - that turned out well. Then there's the times when the redo's due to a leak, broken bolt etc drive me a little bit crazy.
I run a shop full of professionals and they make mistakes - part of the reason I never pay anyone to do something I think I can do - fortunately they are covered by the companies warranty policy.
I would love a crate engine but I was already 5 or 6 years of enjoyment into the stroker and and just wanted to spruce it up a bit
I still ended up with a whole lot more HP for about 25% of the crate.
In the end I never gained anything by doing this one myself except experience. Would I do it again - HELL YES - my wife chuckling in the passenger seat as I left (I'm guessing) about a hundred feet of rubber or so this evening allows me to puff my chest out just little bit.
Go ahead and take a chance and build experience - but only if you can afford to make a mistake. If you do pay someone - ensure they are good people.