Totally your choice and no judgeypants from me at all, but why have you decided not to feed at all?
I had a horrific time with my first. She was starving and I had such a bad infection I genuinely thought my nipple was going to fall off. Looking back she was deffo tongue tied. I can remember looking at my baby and thinking they were evil. I stopped feeding after 12 weeks and looking back I have no idea how I did it that long.
Number 2 started to hurt on day 2. I got passed around from pillar to post. Saw my health visitor, gp anyone that would listen. Spoke to the lady that snips them on the phone to be told
If I was still in hospital she would come to the ward and do it but because I was home I had to wait a fortnight. I rang her three times a day until she snipped him. She said it was a big posterior tongue tie. Feeding was easy after that. I fed him until he was 18 months.
Number 3 no problems at all.
Number 4 I was on to them. As soon as she was born I told anyone who would listen that she was tied. The midwives couldn't see it - to be honest I couldn't either but it hurt and I knew I had fed 2 successfully and so it shouldn't hurt. I refused to go home until it had been investigated properly. They eventually got the specialist lady in (I'm lucky my mat hospital has one) and she found it - again posterior so not really visible unless you know what you are looking for. She snipped my daughter on the ward - the relief was pretty immediate - I fed her for a year.
As for expressing before you give birth. Seriously you don't need to do that. I pumped with my first - it was bloody excruciating. If you are not going to feed, just don't feed, your baby will be fine. Surely expressing will make your milk come in anyhow? So you could just put baby to breast for a couple of days and stop when your milk comes in.
I may have got the wrong end of the stick and it might not be because of pain, but honestly it doesn't need to hurt.
Breastfeeding education is woeful in this country. 10 years on I still have scars on my nipples to prove it. Good luck whatever you decide.