Hahaha I feel the same way. I did a ton of reading on here before I started; and even more since I laid the first board to figure out how to overcome obstacles and see how to get around issues or questions as I run into them.
For the hand nailing, I'm using 2" 6D "Bright Finish" nails with a 5/64" pilot hole. Make sure to put some cardboard against the wall (GREAT tip walkonus!). It helps a lot if you wrap your index finger around the backside of the nail as you're hammering it in to keep it from bending down on you. Definitely get a punch too.
I really don't have a good estimate on how long it has taken me; I tend to dawdle quite a bit, and I have an incredibly short attention span.
I'm not sure what your layout is, but if it's fairly straight-forward, you should be able to knock it out at a decent pace.
The thing that took me the longest was first figuring out where to start, then realizing my stairs were crooked and fixing that; and then laying the first row or 3 and making sure they were perfectly straight.
When you are leveling the subfloor, make sure to mark any low areas with a bright marker (like red), so that you can see it and remember to raise that area up before you lay down your 15# paper. I forgot to do that, and had to pull up 3 rows and then level it out, basically had to start over. At least with a red sharpie you'll see it a lot better than pencil (which I failed to see until I noticed the big dip).
I have also been just going one board at a time, walking back and forth to the pile to get the right size, since there was no room to rack out a few rows ahead of me. Now that I'll be working in the open again that should help to speed things up. Make sure to keep your end joints at a minimum 6" of stagger. Also try not to "staircase"...and my personal preference is to keep from "H'ing" between two rows (having two end gaps lined up with one board in between)
But if you've got the room to swing a hammer on the nailer it'll go pretty quickly, it's the blind-nailing that takes a while, especially if you have to go back and set all the nail heads.
Hope that helps some, if I can help out just shout; I check this forum religiously.
Another trick I did today: