LOL car is totaled.... Just kidding. Sounds like you are pretty handy doing it DIY.
If it was me, (being a cheap illegitimate offspring) I'll buy the official repair manual or All Data online repair manual for like $30 or $60 I forget which price it was. Then just follow the steps. It is less complicated than it looks. Then again.. YouTube vids are a hit or miss, but it would give you a heads up on how to do it.
.
As for fluid, I would differ from the previous post. You can use OEM, but you don't have too. As long as it's the right spec, any other brand would do the job. Of course being a cheap illegitimate offspring I'll go to which ever is cheapest.
Then again... if all your mechanical skills are oil changes, oh.....bend over and pay up. Let a pro do it. As to where to take it...I'll go to a tranny shop, cause that's all they do. Dealers, well...bend over again, with out lube this time. Then again... I'll start by getting quotes from the dealer, local mechanic, and a tranny shop.