Over my head?

I just returned from JoAnn Fabrics with 2 sets of patterns for Halloween Costumes. Just because I have a new sewing machine in my front hall closet does not mean that I am a seamstress by any stretch of the imagination and yet I have now committed to making 4 costumes. I do have some sewing knowledge. Most of it entails memories of watching and helping my mom cut out patterns and fabric on the living room floor. I was a good pinner. Somehow, that makes me feel qualified to undertake this task and every time I tell myself that it's insane, I look at the costumes that the boys have picked out in a magazine and see the $50 price tag and think how ridculous that is because they're poorly made, get holes in them or fall apart completely upon one wearing and I always end up mending them the day of Halloween anyway while thinking over and over "I could make this so much better than this piece of junk." So, it's time to put my money where my mouth is. I'm proud of myself for getting the projects going well ahead of time and the patterns were on sale so that's a good sign I suppose. Wish me luck!