I did use a machine on the merc fella
you can get the same results by hand but it'll take hours for each panel, admin is correct if you use a glaze it adds added depth to the finish on the paint, I don't normally add a separate glaze unless I'm working by machine because of the swirl marks if I'm getting rid of them I use some thing like a poorboys glaze but if I'm working by hand I normally find that Peres53 wax gives the same sort if depth and wet look as a glaze
Everyone has there own technique and preferred products, there's no wrong way of doing things it's just down to personal preference