When I was pregnant an episiotomy was my biggest nightmare due to me reading a horror story about someone having one and then suffering a third degree.
Imagine my delight when I was told (during labour) that I would have to have an episiotomy. I voiced my concerns about the third degree tear but was reassured that this only happened to a Tiny percentage of women.
I had a spinal tap and still recall the surgeon saying 'That was my fault'. I stayed in the operating theatre and was later presented with a photocopy telling me how to deal with my third degree tear.
The tips above are all great - I never looked. EVER.
I took daily baths with tea tree oil (I think this helped a lot).
I took the prescribed painkillers regularly. When I forgot I felt sore. I worried about becoming addicted but the doctor reassured me it would be fine and it was.
I took lactulose to keep my poo soft and used the moist toilet wipes - these were great for the first few weeks after birth. I also liked the massive big maternity pads from Boots.
I was very lucky and had no issues with leaking or pain or lack of sensation.
I went on to have a second vaginal with no issues and a 2nd degree tear.
Someone up thread recommended physiotheraphy. This wasn't routinely offered after my tear but I believe that it is now (in my area at least).
I had it after my second birth and the physiotherapist said that most of ge damage/weakness she could feel was a result of the third degree tear in the first birth.
If you can't get that on the NHS it might be worth trying to look into paying for at least one private session - it really was beneficial for me and I feel like more women should be offered this after birth.
For me it really was not as bad as expected - the fear was worse than the reality. Good luck and take care of yourself!