For the 2019 festival we got coach tickets in the resale - it didn't leave London until 8am on the Thursday and we didn't get in and to our camp (that had fortunately been set up by our friends) until probably about 2pm.
It definitely wasn't ideal getting there that late and I felt like I missed out on a bit of the festival getting there that late BUT we managed to get tickets to the festival and we had an absolutely amazing time all weekend. Some of our other friends waited until the Sunday as they didn't want to get the coach and none of them got tickets.
Moral of the story is, whenever the coach gets there you're at the best festival in the world and you're gonna have a great time, good luck and hope to see you all in the fields in June!