Just to stress that Money Week isn't a 'tipster' they provided commentary on the economic climate and suggest good places to put your cash, what to look for and how to keep what you make. They only make a few 'calls' each week, my personal favourite is their 'gamble of the week' which usually works out pretty well actually, particularly for quick gains.
If you want some sound advice, analysis and commentary on a weekly basis then for £17 a quarter I'd definitely recommend it - I also like reading paper rather than electronic material, much better for long loo trips.
To reiterate what others have said, only 'play' with cash you're comfortable losing, that's a given.
Supposedly ~95% of private/retail traders lose their money or fail to make gains. I'm not sure how accurate that figure is but from reading a large number of forums over the past few years I'd say it's not too far from the mark!
In fact one of the largest forums out there has active threads on trading the Euro and Cable, I like to read it just to see how wrong many people are... that sounds arrogant but I never listen to other peoples advice. Yesterday a case in point, on one large thread they were all talking up Cable but I went short, I just knew from my experience there was a ~60-70 pip adjustment due south, I was right. God knows how many of those guys were long, but there were many talking it up!
Oh and finally we can be a Buffet, after several years of trying I had a 'eureka' moment, tried my need trading style and turned $2,500 in to a 1,000% profit a matter of months.
You need to realise that all successful traders lose trades, that's perfectly normal, I'm only currently 68% accurate but with a reward that's 2-3x my risk, it doesn't matter.