Breech bub at 35weeks 😒

Scared! My baby boy is a wriggler and has managed to turn himself around.. I go for a ECV next week. This is my first baby, can anyone tell me what I'm in for? And how did your expierience go? Praying he turns on his own. Really didn't want a C Section. Any advice would be appreciated. I also have gestational diabetes and am minus blood type 😪