Let people choose the parties they want. It doesn't matter. There are a lot of people playing this game at different levels of experience. There are plenty of people willing to try just to learn the fight and have fun with it. These are not the ones shouting for parties, but they are out there. It doesn't matter if you are undergeared or inexperienced, You probably won't succeed, but there is no rule against trying. But you want to find people who don't mind that or you are going to have a bad time. But there are people who understand that wiping several times is the only way to learn. (And no, Youtube doesn't give you the instincts).