oistene is correct. Preparation work is the most important stage, even a world class painter can not do a good job if there are mold lines / flash marks on the mini.
A normal size mini can take over an hour just on removing the crap, this is before you start pinning or converting etc.
Slow it all down, real take your time on the clean up then get a real smooth undercoat, this can take 5-6 thin layers to build up.
Plan your time and aim for a certain job to be finished at each stage / sitting. For example tonight im aiming to get the gems fixed on the elf im painting and nothing more, if any more gets done that's great but as long as you stay focused on the planned stage.
Hope this helps
