Apparently if you massage you perineum with almond oil, it makes things easier. The only problem I had was, with short arms and a large bump, and being slightly off balance, I couldn't reach. DH tried his best, don't know if it made any difference.
I did take raspberry leaf tablets for the last 2 weeks, the mw said that she didn't know if they made any difference, but didn't think they would do any harm at that stage. They are supposed to provoke/help labour.
For those yet to go through this, the pooing uses the perineal muscles, it's not just a question of your anal sphincter relaxing and letting the poo out. After umpteen hours of labour they are in about the same condition as if the poor things have done the whole 3 levels of the 30 minute shred all on their own. So.....they find it a bit difficult.
Looking back, I nearly pulled the red cord, cos I had this poo half in, half out, iyswim. Fortunately the bidet next to the loo, had a shower attachment so that I was able to spray underneath which softened the poo and helped it out. Such relief. When I told the mws they all ptsl. When one of them had recovered enough to be capable of speech, she said she was glad I hadn't pulled the cord, cos they wouldn't have come anywhere me and handed me a pack with a sanitory towel in, and said if I had any trouble next time to push that against my bits, to help.
Glycerine suppositories help as they melt and soften the edges a little, as well as helping the poo to slide out.
Good luck to one and all.