After my 1st resto, I learned.  When buying a bike that's been sitting....  Soak all nuts and bolts w pb blaster on first day... Basically whole bike.  Do it again next day and let it sit again.... After 3-5 days do it again and start loosening every single nut and bolt.  Don't remove them completely, just break them all loose while bike is together.  Having the bike together helps so much and makes it easier to steady it w the really stubborn ones.  After they are all loose, then start removing parts!