Hi,
Your lo for sure does not need to eat 3-4 times a night anymore, but don't try to wean him off all those feedings at once-- he'll be very confused and you'll be in pain! Since he's not taking in much in the way of solids yet, he may need to bf a little more often during the day-- maybe every 3.5 hours? Keep the 11 p.m. feeding as dream feed, but when he wakes up again, use PU/PD to get him back to sleep. It may take a long time the first few nights. Next, cut out the feeding closest to the morning wake-up time, using PU/PD. You may find, as I did with my DD that once he figures out he's not getting the breast every time he wakes up, he'll just go back to sleep on his own for the other times he would normally feed as well. It's great that he can put himself to sleep; it will be that much easier for you. You might ask DH to do the PU/PD for those first few nights, since your lo won't associate dad with nursing, and might go down a little easier.
You might find that your lo needs to eat once or so at night for a little while longer, especially if he's in a growth spurt. But if he just nurses a couple minutes before he nods off, he doesn't need it, and you can wean off that last feeding as well. Good luck! You'll be so happy you did this in the end; in the meantime, come back here any time for support.