Hm maybe you, make some higher education in a Fachhochschule or something...

Well, the best thing of getting precise answeres it to ask people in a company wich developes games, or maybe the G..M.E group can help?

One chance to get work in a firm is experience, so go into Mod teams and so on... as PlatinumGold just said.

Making your own game should not be that easy way, but maybe you sucess, i would firstly talk with Game Designers!

I hope i could help