blend door actuator

I had a shop tell me my "blend door did not work" then my "actuator needed replaced" then I may "need to check the housing too". and lastly, he told me to "check the fuses". first, what fuses do I check? Then apparently did the trouble shooting already and narrowed it down to this. I bought a new blend door actuator but I need to know if anything else might need to be checked or replaced? I am really lost and mechanically retarded but have put too much money into this truck lately and cant afford anymore so I am going to try to fix it myself. just need a little help. (P.S. I just bought the truck)