Hi!
Sounds like you have a good deal of experience of home education already, but you recognise that it would be a different experience this time around, so that's a great start! I'll just mention a few things briefly which may or may not be in your mind already, so you can pick up on any of them which seem relevant.
Depending how long ago it was when you were last HEing, you may see far more opportunities now created by the widespread use of the internet. It's easier to connect with other families locally, swap tips more widely (especially handy if your child is having some very specific challenge which somebody else on the other side of the country may have dealt with), and do online learning - we are constantly looking things up and watching videos.
HE doesn't have to be a permanent decision; your child may end up going in and out of school over the years. I think this is particularly true for children with special needs. There may be a very suitable school for a few years which you are happy for your child to attend, and then the next school is totally wrong for her and you do HE for a while. There's a misconception among non-HE people that moving from HE to school, or school to HE, is incredibly difficult, but that isn't true at all. So don't feel that must make a long-term commitment if you start off with HE. It really isn't like that. You can just try it and see how it goes.
Your dd would need an EHCP to attend a special school, and an EHCP can be helpful in specifying provision even in mainstream. You can apply for one whether or not she's in school. It takes many months to get that sorted, so if ever you expect your daughter may be going to school within a year or two then make an early start on that. (So I've heard! But arranging an EHCP sounds like a huge palaver to me and I've never done it as I don't expect my child to go to school any time soon.) The Mumsnet special needs board has loads of highly knowledgeable and helpful people on it who can advise you on that process.
You may well find that your classroom experience is quite irrelevant to home educating your own daughter. It's all so much less restrictive outside of school. For example, you can let her make noise and move around if that is how she learns best. You don't have to make her sit and work at specific times; in fact you don't have to "sit and work" at all if another approach works better. You can use whichever curriculum you want (or none at all) and adapt it until it's right for her, without needing permission from anybody. There's no pressure to meet age-linked targets, so if she's simply not ready to work toward reading at four or five you can just leave it until you feel the time is right.
That's all I can think of at the moment. Hope it helps!