Hi Lola, you know my hairloss advice… cut it as short as you can possibly do it before that first cold cap. I know its hard and you dont want to but it will make things easier as you go through it. The hair doesnt just fall out, it becomes very weak at the edge of your scalp. So any brushing or washing could pull more out than you want. If I comb my hair it comes out, if I leave it, it stays put. The less you need to touch your hair the better 
Get yourself a silk/satin pillow case, despite my hair coming out in flurries when I blow dried it yesterday (on the coldest setting but I wont do that again) ive woken up with non on my pillow this morning so it does help.
Get yourself some really gentle, as natural as possible hair shampoo/condition, though if you go pixie short you wont need it much. After cold capping you can rinse and leave it haha It’s so easy having short hair I might never grow mine long again!
Only wash your hair with cold/warm water because a combination of the cold cap and the chemo makes your scalp really sensitive and itchy. Another reason for cutting it short, after my first round I wouldn’t have been able to brush it. Instead ive got a wide tooth comb to gently go through it.
For mascara, find a water based one that comes off with just a splash of water. You dont want any unnecessary rubbing of your eyelashes or eyebrows, 3 rounds in and mine are hanging on. But less is more. Be ready to embrace your more natural godess look. I promise you get used to it. And remember it’s not forever, its just for now. I hate wearing loads of make up in the summer so its a good season for less is more.
When they put your cold cap on they spray your hair so its wet, they also put a conditioner on it for you so if you want to take your own you can. I went for a coconut spray leave in conditioner.
If you can find yourself a heated blanket, one with a battery pack that will come in handy. You will have a cold head but the rest of you can stay relatively warm under a blanket. (It might be worth you asking them as for private care they might have it all for you which would be nice)
So as short as possible, and less is more I might be delaying the inevitable but having short boy hair is better for me at the moment especially since I decided not to find a wig. My worst hair days are now my best and I can walk in public, head held high without a care now. No one knows what my hair looked like before, no one even cares. And I posted pics of my haircut on Facebook so no one was jump scared if they saw me haha
Lots of love