Echo the twin pillow, have more than one (doesnt need to be expensive, mine were around £15/20 from Asda online). Have one for home and one for when you eventually visit people.
Another godsend for me was two rocker chairs for the babies, or babybjorns (pricey but you can pick them up on Facebook). Twins are relentless and there will be moments you need to leave them in the chair to dash to the loo or quickly make a bottle or two if you're home alone during the day.
Vinted have a special section for twins clothes, stock up on there as it's great!!!
I would say, everything you do, make life easy for yourself and don't compare yourself to your friends who have had or having 1 baby as it's not the same. I remember signing upto baby yoga with mine at 6 weeks and finding getting out of the house so difficult, I'd cry the whole way there knowing I wouldn't be able to do all of the exercises with both of my babies. I wish I hadn't put so much pressure on myself.
2 years down the line, it's still challenging, but differently so, and their bond and friendship is beautiful to witness develop.
Deffo agree with it being a team sport! Ex DH and I split when twins were 7 months old (nothing to do with them, everything to do with him!) and I don't know what I'd have done without the support of family.
Xx