I was first taught Magick in the infant's, by a 6-yr old called Daniella - who was from some foreign clime and had a scar down one cheek. Here's a simple spell she showed us - when rainclouds gather, form a posse / coven of 3-4, and repeatedly chant RAIN RAIN GO AWAY / COME AGAIN ANOTHER DAY. This ALWAYS works - the rain will clear up in 5 minutes. But be aware there's a karmic payback - I can't count the number of times I was out in a t-shirt or light jacket, and it suddenly started to bucket down from nowhere. This is known as 'raincloud retaliation', and it even happens to dub witchdoctors, so deal with it.
The best place to do magick in London is on the Underground system - don't bother hanging round woods or graveyards or any of that crap. Stockwell to Brixton on the Victoria Line is a potent place to do it. I've conducted experiments with 'text magick', using SMS and SIM cards, but the results proved inconclusive.
Here's an old trick for gatecrashing your subconscious - get a pen and paper, and scribble down a couple of paragraphs while counting, out loud, from 100 down to 1.
The only thing that pisses me off about the whole magick scene is nobody can tell you how to win on the horses. Fuck Azathoth, I want the dosh.