The only advice I’d offer you is moisturise, moisturise, moisturise.
They say to avoid alcohol running up to your session as it thins the blood. Eating green vegetables is meant to be good for the blood, rich in iron.
I have a routine that I’ve always stuck to, I shave prior to my session, I always take a drink and a mars bar for my blood sugar levels and bang a couple of Paramol tablets (over the counter from Boots the chemist) about half an hour before I arrive at the clinic.
You may be fine with the R91 but I always found it was too long and if I used a better shaver I could go all day without shaving again. I use 2 shavers now. I use a Remington Titanium X R6150 which is loads better than R91. Then to get almost Razor close I use the Braun Series 7 foil shaver.
The Remington you’d get on eBay for around £40, the Braun is a more expensive bit of kit but a quality investment. Again I got it off eBay for loads less than the RRP. I’ve had both for over 3 years and they still work brilliantly.