Before my first brew I did tons of on-line research about all aspects of home brewing despite this I still made several serious newbie blunders, and it made me realize just how much bad advice and 'myth-information' is out there.
My first four brews - 160 pints of beer! - are ruined because so many blogs, posts and tutorials claim that it's perfectly safe to start your syphon by sucking the tube but for me it isn't, some people obviously get away with it but others either have more natural bacteria in their mouths or else they simply have a particular strain that beer is especially susceptible to, either way I'm 90% certain that syphon sucking was what infected all my brews.
DON'T start your syphon by sucking it, you could easily get an infected brew. I got four in a row before I realised. Instead buy an auto-syphon or try the method in the video below.
Edit by Chippy_Tea - Before new members rush out and buy an auto syphon read the full thread there are cheaper ways of starting the syphon with no danger of contamination.
DON'T start to fill your fv without double checking that the tap is in the 'off' position! Sounds stupidly obvious but it's so easy done. (I did it )
DON'T rush a brewing session. If you know you have to collect your daughter from school at 3.15 then don't start a brew at 2.00 pm.
Full thread - http://www.thehomebrewforum.co.uk/showthread.php?t=51684