Ok, done!

Well it took the full 3 hours and my arms really did cramp, but yep, I agree, it's definitely worth it.
The clarifying shampoo made my hair soooo squeaky clean. Was a little worried it was going to be really big and frizzy without the conditioner, but obviously, that was only a temporary side effect. Actually though, it wasn't that bad. It was frizzy yeah, but it wasn't as frizzy as it would have been just using a normal shampoo and no conditioner.
So I have to confess, I was embarrassingly really nervous about putting in the treatment, because I felt completely clueless and I have so much hair! I just didn't know where to start! I kept it about 2 cm away from my scalp cos I was really paranoid about my hair getting greasy. At this stage I couldn't see how this could try not greasy. My hair was completely saturated, but I was trying to make sure that it wasn't. I used just over 3/4 of the tub, which surprised me cos I have really long, really thick hair so assumed I'd use it all.
I waited about 25 minutes and then I began to dry my hair. Ok, this bit's the worst bit. Yes, I had warnings that your eyes sting, but my god! My eyes streamed! and when I breathed it in, it was so strong. I actually felt like I'd done myself some damage and I'll definitely be invested in some kind of mask next time. Eventually I just kind blind dried my hair, which was actually fine. It felt crunchy before I dried, but as soon as the heat hit it, it actually felt quite soft and smooth. I still can't get how my hair doesn't feel heavy and greasy after all that treatment, it's weird, but it just doesn't.
By this stage I could already feel my hair was in better condition. The straightening was fairly straight forward, although I sectioned it into really small pieces, so as I said before, it took a looooong time. I used the heat 'resistant' gloves, but for me, the heat still got through and they just irritated me, so I abandoned them in the end. My fingers weren't too bad though.
My hair feels clean, smooth, but yeah, it is a tad flatter than I'd usually wear it. It's not terrible though! My GF say's she'll go out with me tonight, so it can't be that bad
Oh and I'm not finding it too hard not tying it back, or putting it behind my ears, which is something I thought I'd really struggle with. It's only been a few hours though 
I'll report back after the first wash.