I'd advise against cutting out the visor until you are complete. I know you want to try it out and all and it's a great feeling, BUT you lose stability and make the bucket prone to warping.
I'd concentrate more on getting the bucket shaped as nicely as possible, don't worry about the dinks so far, get the shape right first, then worry about nailing the detail and getting it smooth.
It takes a lot of patience, I know, going through what you went through with my cheek pieces, couldn't get them smooth for love nor money, but a systematic process is what you need.
I'll speak to Mr. Kyramud about posting his bondo lesson on the turtorial thread and see if he can expand it to sanding too.