sequence isn't that important if you have the time. if you put something together in a bad sequence (like installing lever clamps before putting the bars through a quill stem), you simply remove one of them.
i always put something like the rear derailleur on a new build before i really should, 'cause i get anxious in how it will look.
a real problem though is putting something like bar tape on your bars and then wanting to deanodize and polish them. don't do that. remove road rash and polish everything pre-build.