Dom how on earth can you come on this section trying to get a rendering job of another spread when you've said you're trying to get on a plastering course? You're just making yourself and this forum look daft.
Decide which trade you want to get into and then try and get a start as a labourer, because you cant just decide to be a plasterer, bricklayer or groundworker at the drop of a hat, they all take time to master, some more than others.