Back in the dark ages I did a couple thousand rolls of XP-1 that way. It wasn't any big deal, just a wait for the chemicals to heat up in a waterbath. Figure out your cost-per-roll to do it yourself compared to the corner minilab; if you'll have only a small volume it may be less expensive to go to the minilab.(posted 8173 days ago)There aren't huge contrast changes with process errors.
BTW, if you try it and find that the 3'15" development time is too short, dilute the developer 1:1 and give it about five minutes.