You are looking at roughly 8 weeks. Depending on what bodyfat you want to compete at will tell the story. A great many competitors are going leaner and leaner and certainly 9% bodyfat is becoming a norm. So if you look at getting down to somewhere between 9-12% bodyfat to be comp ready - so you have between 13-16% to lose in 8 weeks. At a max you could be looking at losing around 21# which would put you at 2.5#/week. This is doable if you can consistently lose that steadily but if you plateau or don't keep up with that number 8 weeks is very tight. If you doing your own nutrition that could be a huge issue too.
It seriously comes down to how you want to get to the stage - you either don't mind either way just to have the experience or you want to look great. This is your choice to make. It is alot of time, money etc to invest and be really unhappy about how you look as compared to the other competitors. You want to feel great when you do these shows and you just have to decide if you think you can reasonably be ready by June 12th. I kind of layed out the above just to give you some idea (not exact) of what would need to happen with your numbers in order to be ready for June 12.
Good luck with whatever you decide to do and you know we will all be behind you no matter what.
"Only those who risk going too far can possibly find out how far one can go"