Afternoon Trin, I'm pleased everything arrived and is all good, any sweets left?! 
Now then lovely lady, every single post up there ^ about tomorrow is bang on, my neck aches from nodding! You're going to go from this to that, here to there and back again so many times in the next 22+ hours. And I'm afraid to say that this is going to be a bit of a waffling post to you.... sorry 
As everyone has said, it's your choice how you get there - you don't drink so have no worries about driving. The girls will be fine going with you or someone else, but I do think if you drive, having someone in the car with you (as others have said) just in case you become overwhelmed on the way there or need to stop would be a good idea, for your own safety if nothing else, I hope you understand what I mean.
Cliff's family are not for you to worry about - and I do mean that in the nicest way possible because YOU have enough on your plate sweetheart, let them decide how to get there, etc. I assume that his ex-wife will be there too? So she can help you out again maybe? :)
Turn up early, before everyone else and wait to be let in if that's what you'd rather do but bear in mind that there may be a service before Cliff's, so you may have to wait.
Gather your thoughts if you want to before you go in. Or just go for it. Take a pen and paper, you might think of something you want to say last minute or people might want to give you their details to keep in touch :)
Slip in after everyone has arrived and sit where you like, stand at the back, wait outside if you feel it's all too much. The girls and Cliff's family will all be fine, there will be people there to help with the younger two.
People will understand and will help you, if you need them to lovely. Ask for help, say the words, it's not failing, it's not weakness, it's human nature. And it shows your inner strength, the strength that you now have in abundance because of Cliff. :)
No-one will judge you for how you behave, venus has said everything so very well.
If you do have a panic attack, then you know what to expect don't you? You know how to deal with it, it'll be fine, it will pass and YOU WILL BE OKAY. xx
And, so what if you do have one? I bet you anything you like that it wouldn't be the first time that someone has had that happen during a service, it won't be the last, and it won't be as bad as you think it's going to be, because it might not even happen. Give yourself some credit, you know more now about yourself than you ever have.
If you don't want to talk to anyone, then don't. If you want to waffle away to everyone that's there, then do that!
There's only one certain thing in all of this though sweet lady, until tomorrow, when Cliff arrives at the house, that will be the time when you will know for sure exactly what to do, maybe not before.
It will all just click, fall into place, sink in, it will suddenly be so very real that you'll feel the fear in your heart, the reality will hit you, hard, it will be raw, almost burning. But you know it's coming and you know that you can do this, however you want to, you'll know when that time comes, when that moment arrives, you'll just know what to do.
Between now and then you will swing from every emotion under the sun. and because you've been here before, it's going to drive you nuts! So, come here and let it out, just as you are doing.
Remember that you are stronger this time. YOU ARE. You will shine, you will stand tall and proud and you will be the woman that Cliff showed you was hidden away inside all of the hurt you'd held onto for so long.
Tomorrow, tomorrow will be the saddest day because it's the closure isn't it? The last goodbye and for me, the hardest part.
I'm just so sorry that you are even having to post these messages again Trin 
Massive love to you all. I hope the card arrives in time too darling xxx
Mouse xxx
(The funeral is tomorrow afternoon for those who have asked)