I have been casting jewellery for about 25 years , and for the last few years I run a couple of weekend Casting classes in the summer. These are a short introduction to lost wax casting, the first day you will carve a wax model and invest it in plaster. It then goes into the kiln overnight and you will vacuum cast it the next day, clean up any roughnesses and then make a vulcanised mould and inject liquid wax to make copies.
The course is aimed at jewellers who have perhaps done a little casting at college, but I have had students with some craft skill who have produced very creditable results.
I will post more details soon for dates and costs for 2015.