It depends on the guy. Some report no pain at all, some report pissing razorblades for a week. My own experience was about 3 days of real discomfort, and 2 more of it just being annoying. Pissing blood the first day was somewhat disconcerting. I forgot that you will bleed on the inside too.
Other than doing your salt soaks, leave it alone for as long as you can possibly stand it. By the nature of what it is, it's going to take abuse, but try to let the thing heal first. At least 3 weeks. Sex too early, hurts. Take it easy for at least another 2 weeks. Wear a condom. You have a break in your skin, and all sorts of stuff that would normally have no hope at penetrating your penis, now has a very easy entry point till it fully heals.
Experiment with underwear to see what is most comfortable. Some like everything all bunded up so nothing moves. Others like freeballing. I did both, depending on the day. Whatever you choose, you will be acutely aware of where your penis is and what it's doing for a good month or so. Not in a bad way, but it's a constant little "hey I'm right here" message that you eventually learn to tune out.
If you have a barbell of one flavor or another, check the balls right before you take a leak. It is a unique and unpleasant feeling to hear a ball fall out of your pant leg and hit the floor, especially with others present, who might wonder just exactly what the hell happened.
Peeing issues vary. Your anatomy, where you are pierced, size of your urethral opening, jewelry size, diameter, all sorts of things play into what issues you may have. Conensus opinion seems to be the larger the gauge of the jewelry, the more likely the urine stream is to follow the curve of a ring. You can wind up pissing downward, or even backwards if you are cut. The easy fix for this is to turn the head of your penis sideways, or upside down, or to wear a bent barbell. People with larger gauges are also more likely to report issues with leaking from the bottom hole. Pressing the bottom ball against the hole will usually "seal" it. Urinals are not a problem, but a regular toilet can become hard to hit without making a mess. Practice peeing in the shower. Beats cleaning a seat, a toilet, a floor, and maybe a wall or garbage can.
The initial pain and annoyance is definately rewarded a few short months down the road. Stretching to bigger gauges makes a big difference. It really started paying off at 4ga, and 2ga is even better for me. Yeah I have to sit to pee at a regular toilet, but in return, even a boring jerk off session has become so much better. And sex? MMmmm...yeah...your going to like it.