I've never done a ring and pinion install, but there are several threads on jeepforum.com (the CJ section, I don't have a YJ) and if I recall, a couple of the guys were first timers.
But with the Dana 30, your looking at $400 in parts alone, with the ring and pinion, master install kit and a new carrier, personally, I have the same gears but once I started looking at parts cost,I decided I could wait for a Dana 44 front and spend the gear money on a stronger axle.
I picked up a Dana 44 rear end with 4.27:1 and a Detroit locker for $75 on craig's list, before I Realized I couldn't gear the Dana 44 to higher than 3.93:1 while keeping the Detroit locker, and the Dana 30 needs a new carrier to gear lower than 3.54:1, with the cost of regearing both axles to 3.93:1 it's Just not worth the money to keep the Dana 30.
If your happy with your Dana 30 I would buy a Dana 30 that already has the gears you want, transfer your lunch box locker (if the new axle doesn't already have one), put the spiders back in you original axle, and sell it to reduce your front end expenses.
Also don't be afraid to look at TJ and XJ axles, you can strip the brackets easily with a grinder and a sawzall, leaf spring perches are cheap and even if you don't weld it would be cheap to have that done.
Here is the first Dana 30 ad I found on Craig's list, from a YJ, 4.10:1, $250, Good luck,
http://lasvegas.craigslist.org/pts/2788937914.html