I am wondering how I could say this with just one or a few words, but I cannot seem to be able to find a correct sounding way of saying it. House painting student? House painter in training? Soon-to-be house painter? It all sounds very stiff and clunky, and so far google has been of no help.
I would use it in a short introduction of myself, one that is formatted similarly to "30. Male. Applied biologist. Artist.", so it does not need to be formal at all. The course I am attending is not an apprenticeship, so I am guessing calling myself an apprentice would be incorrect, too.