2 weeks plastering, one week plumbing and one week tiling and it wont be enough as i know for a fact i already know what will be covered.
This type of course would've helped increase your basic knowledge and skills that are sometimes needed for prep, removing toilets/sinks, boarding walls... all the type of stuff you've asked about over the last few months.
Chicken and egg though with needing work, but needing experience to get work.
But its usually easier to find work when you're in work - ie. Any work. Paid employment, whilst persuing dreams on a weekend/evenings etc. As in, some of the folk that decide on a career change etc, but have the option and a Plan B to fall back on. Instead of having 1 egg in 1 big basket