I didn't see this original post or I would've commented!
A year of hair removal is recommended because hair grows in cycles. The year time frame ensures that you'll most likely hit every cycle. So I would focus first on whatever area the ALT urethra is formed from, and then focus on what would be shaft. Unless you want to sit for longer and get as much of it at once as possible.
As far as how many sessions, that really depends on you and how quickly you want to clear each time you go. I've heard of some guys going weekly for as long as it takes to clear a section or take care of any hairs growing back. I've also heard of guys going for longer sessions less frequently. I'd do weekly or twice weekly sessions until it's completely clear, then I would wait a month and do the same thing again. Repeat monthly until you're getting no regrowth.
I did combo laser/electrolysis when I was planning on RFF. If you're going to give that a shot, I wouldn't do laser more than 3x. It causes the hair to lighten, which makes it more difficult to see and thus makes it more likely to be difficult to perform electrolysis on or be overlooked all together.
Electrolysis never bothered me, but laser is probably the most painful thing I've been fully conscious during. I have a really high pain tolerance and especially at later sessions when they have to up the power level on it, it was almost unbearable.
