I've read so many birth books
I think my favourite one is Birth Skills by Juju Sundin. Milli Hill's 2 books are cheap on amazon kindle today.
The Aniball scares the crap out of me - doesn't seem like a good idea at all!
Perineal massage apparently has a proven effect, but for most women it's just painful/uncomfortable and you'll never know whether it actually made a difference to you personally.
Breathing practice is about learning the techniques for breathing so that you kind of automatically go into them when you're in a stressful situation. I didn't find it was hugely important to know them perfectly. Knowing how to do relaxing/deep breathing is enough. Helps you through the early stages. By the time you get more into it it doesn't really cut it (IME).
Raspberry leaf tea can't hurt. I drank it with DC1, not with DC2, have ordered some for DC3. DC1's labour was insanely long so not sure it helped there. But it felt nice and exciting and "something to prepare", which is why I'm doing it again :) You can take it with sugar if you don't like the taste of it plain.
Massage practice not hugely necessary IME - if he's done it once he'll have the gist and can probably do it if you want him to do it. You also might get into labour and then be like get the fuck away from me.
Dunno about practising meditation with partner. I think I (and more importantly DH!) would have just not been able to take this seriously in advance. That said, being able to laugh together is no bad thing and laughter promotes oxytocin!
There's a good podcast for dads/birth partners, called The Ultimate Guide To Being a Birth Partner. The first 10 episodes are like the "basics" which are pretty worth listening to. They're all really short and direct and to the point with no waffling. IMO, episodes 3, 4, 6, 8 are the most important and all together that's only about an hour. So if you want to prepare your partner you could make him listen to those.
Being active/fit is definitely worth doing as long as you don't have any issues like SPD which could be made worse by exercising. Squats in particular and training yourself to hold a squat for a long time is brilliant in terms of birth positions!