I can only speak for myself (but my suspicion is that I'm not alone) but when I started I tried every single trick and style of magic I came across and subsequently learnt and immediately forget hundreds of things which I practiced maybe once or twice. After a few months I realised that I didn't actually know any tricks at all or at least not to any standard were I could competently perform them. Instead or actually working on things I just went from one thing to the next, often wasting money on buying the new shiny toy that was doing the rounds and I wasted a massive amount of time.
It's taken me years to stop doing this (I think I've actually managed to cure my C.U.P.S!

) and I'm now at a point where I'm really focussing on just one thing at a time. I've spent about the last nine months developing one single effect and it's really one of the most basic mentalism things you can do but I'm getting really happy with it.
One of the best bits of advice I've received from this board and from others in the large community is to take things slowly and really work on them and don't try to be able to do one thousand effects. If you want to go out and perform to your best, work on maybe three at most but make them the best three that you can do.