This is good advice but bear in mind you will be full or part time self employed and that involves paying tax and claiming expenses. Realistic expenses will be very different for some of the above roles compared to escorting! Massage would undoubtedly be the closest in terms of the items you might need to be claiming for! Of course if you already escort part time then you'll be declaring your income anyway... 
That doesn’t really make any sense. Telling a white lie to family and friends has nothing to do with what’s on your tax return.
You can have whatever you want on your tax return as long as it’s soley for your business. So if you want to do a nail course and claim it as an expense you can, not all business ventures create income or you can simply say you were going to become a nail technician but then it wasn’t really working out so you tried something else.
You could just say you’re working for angencies on temporary roles here and there.
As for a gap on CV, you can make up any old tosh. You were a paid blogger, YouTuber, dog breeder, eBay seller, your own cleaning business etc, all self employed roles so it would be normal to have the gap.