I used the cold cap with good results. I thinned slightly on top.
I highly recommend trying it. I don't think a haircut is always necessary.
I had my hair cut shorter. The only reason being, that I have curly hair that is difficult to manage without blow drying and straightening. I did see a lady at my Chemo place who had long hair, and was having excellent results.
If you have time before starting Chemo, I would recommend getting your hair coloured to your natural colour, as your roots will show before you finish Chemo.
I did not take any medications relating to the cold cap.
I did not do any special washing or conditioning on the day.
The main thing is that your hair must be very wet, to conduct the cold to your scalp. I believe curly hair needs to be wetter.
The cap must fit well, making contact all over.
Thinning occurs especially if the cap does not fit well.
Sometimes I had an extra strap over my head and under my chin.
I believe washing your hair infrequently, and not styling is the best.
I did risk gently blowdrying my fringe, with no additional thinning. I did feel that was risky business.
I know it doesn't work for everyone. You should know if it works for you, by your second or third Chemo.
If you want photos, just ask.
Wishing you all the best.