Exterminator advice please?

I'm in MI and in my room (attic room) I'm having a big struggle with spiders. Like GODZILLA sized nasty spiders. I had the same problem last summer but coped with it because they were so little and they all came out of the same closet. Recently I was out on my front porch (that has an awning over it, the awning leads into the attic which is connected to my room) And there had to have been over a dozen of the critters all over the porch. I know it's silly and I'm so one of those girls that HATE spiders but they are quite big, yellow and translucent. Also there have been some tan ones with the big huge shells on the butt hanging around too. So I wanted to ask if anyone knew anything about exterminators. I tried to contact companies but they all want my address and I'd have to consult with my parents first I just want my room, my room only sprayed but I'm not sure if that is ok to ask, and I'm trying to figure out the price as I don't want to go overboard as it will be cold again in a few months