I've been a lurker here too, so hello everyone.
I dithered for ages, talking about going TV free, reading about it etc, and realised i was making it into a big deal, hyping it up into a whole new way of life that would mean re-structuring everything we did. A lightbulb moment for me came when reading some older posts on here, which suggested that you don't really have to *do* anything - you just do what you ordinarily do when not watching TV (ie just day-to-day living, whether that be washing up, singing, making food, going shopping, to meet friends, whatever) but just do it all the time.
So one morning I just didn't put the TV on, and when my middle child asked for it (he's 3-and-a-half), I just said "Oh, telly's for when there's nothing else to do, it's boring really) and distracted him with a game, or some dancing or something. It took about a week of him asking for it, but he was easily distracted, and i put books, paper and pens, lacing cards and some Montessori-inspired games (the command game, the label game) on shelves he could reach in the dining room, away from the room with the TV in it, and within a week he was automatically reaching for these.
It's only been four weeks, but he hasn't asked for the TV at all, and miraculously spends far longer entertaining himself with other things than he did before. Maybe he'll revert to asking for TV at some point, ( we've been lucky, as the weather has been good - unusual in England! - and we've been outside a lot more), but I'm surprised how non-terrible it has been!
What I'm trying to say, in a long, rambling way, is that you don't really have to prepare and become super-mum with loads of amazing activities up your sleeve. Just don't turn on the TV, and carry on the ordinary activities you do. I have a 14-month-old and a 15-year-old too, and it hasn't been a problem. The teenager is allowed to watch TV after littlies are in bed, but has cut right down, and the baby doesn't care either way - she's happy to be doing what everyone else is doing! As your lo is so young, I'm betting she'll easily forget all about the TV.
Go for it. The worst that can happen is a few days of complaining. I also found reading Ellen Currey-Wilson's The Big turn Off very helpful, and letting the children join in the chores (rather than distracting them with TV) a help - using ideas from Montessori Play and Learn. The hardest time is when trying to get the baby to sleep - quiet stories, some play dough, setting up a train track in advance etc have all helped. Someone else also suggested a spoken -word story fr this time too, but i haven't tried that yet.
Sorry for the long ramble. Good luck - just do it, a morning or an afternoon at a time.