Years ago, my oven was out of commission for almost 3 years. I borrowed a Westinghouse Electric Roaster from my SIL, and used it for everything. Whatever I did in my regular oven I did in the roaster and everything turned out absolutely great. I could only bake one cake layer, one pie, a dozen cookies on a 9 x 12 cookie sheet, etc. at a time, but everything turned out great.
Don't be afraid to try it. Good luck!