same here, iv done kitchens, bathrooms built a few garages, restored a few classic campervans, iv just finished doing my bosses office/washing room, that went back to brickamd replastered, im good at mixing plaster but i ant tried plastering, but with what i watched of my boss doing the plastering is get it on as fast as you can and keep working it, the more it dries the less lines you get.