Hi and welcome
You're in good company - I started EASY at about five months for my DD so it's definitely not too late
Have a look here for some good info on getting started:
Starting EASY - all you need to know and more!PUPD is probably the best sleep-training tool for you to use to help break the feeding to sleep association and help him learn to settle on his own. Given he is six months I would aim for a two-nap routine with the day looking something like this:
(I'm basing this on a 6.30am WU - is that reasonable for you?)
WU and eat 6.30am
A
S 9.15/30 - 11
E 11am
A
S 2-3.30/4pm
E 3.30/4
A
E as part of BT routine
S 6.30/7pm
It won't go perfectly to begin with and some days you will need to offer an extra catnap in the afternoon to get him through to a reasonable bedtime. Don't be afraid to do that or to bring BT early on days where he doesn't nap well.
A couple of caveats - given he is EBF and not yet really established on solids, he may find it too long between the WU feed and feed after the first nap. Some babies can manage it fine, but others can't. If he can't, offer a top-up fed maybe 30 mins before naptime in a bright room. I would suggest also changing your BT routine so a feed isn't the last thing before going into his cot. If he tends to fall asleep feeding, feed him in a bright room and sit him up if he starts dozing off. Then maybe read a story or if that's too exciting, sing him a little song before putting him down with his eyes open.
With night feeds, if he is used to being fed often it's a bit much to expect him to suddenly go all night without. I would suggest you note the time of his BT feed, and then work out when 4h later will be. If he wakes before that time, use PUPD all the way until he goes back to sleep even if it takes you past the 4h mark. If he wakes past the 4h mark then feed him straight away (don't worry if he feeds to sleep in that case) and make a note of when the next 4h will be up.
What do you think?