Fisher levels the easiest, but I found that min and bot are a lot more reliable if you want to farm scrips.

For low lvl crafters you should try to make everything once as it comes with exp bonus. Once you can increase quality try to increase it as much as possible even if you will not end up with HQ item since exp depends on quality increase and this will help you to save resources.

Do GC turn-ins every day. You get double exp for HQ items and exp is also doubled for starred items. It is quit ea bit of exp and you can level crafters (and gatherers) without much effort (that's what I did for ShB crafts).