Absolutely do it!
If you're going to do it, make all the changes so it's a painful few days but then it's done.
Bedtime routine - specific order to help 'healthy' sleep habits
Pjs
Milk
Teeth
Gro bag
Bedroom
Shut curtains
Book
Cuddle
Bed - wide awake
For the timebeing, do the same book at every sleep, it's a good cue.
Then put down, lay down and say goodnight.
Sit outside room - get something comfortable.
Listen - 1 minute of full crying before you go back in. Don't just time it, listen. If he stops then restart the clock.
Go into the room, aiming to be there for 30 seconds - 1 minute MAX. Don't lift out of the okay. Just lay back down if stood up and say something along the lines of 'there there, its okay, it's time to sleep now' and leave again. You're not there to resettle, just to tell them that you're still there.
Repeat as above at 2 minutes then 5 minutes until he's asleep.
Work out your tactic for nighttime. I'd put down to bed at 7ish and say that you're not going to feed him before a set time and that you're only going to feed him once before 7am. At 11 months, personally, I'd completely night wean but whatever you're comfortable with.
Repeat the settling for night wakings and naps and you should be pretty sorted in 3-4 days.
Good luck! Hope your DH is okay.