Vanitys Fire just brought up a fantastic point - the value of meditation really can't be understated.
Due to our evolutionary niche, humans have extremely distractable minds. Once upon a time this was what let us notice every new sound or smell that might have warned us that something was about to rush in and eat us. Not much of an issue in most of the world anymore (we're looking at you, India) but we really haven't evolved away from it. Moreover, modern technology with its channel-surfing, constant commercials, pop-up ads, cellphones, instant messengers, and web-browsers with multiple tabs... we've really encouraged the heck out of this tendency. There is, in fact, very little in modern society which encourages single-minded focus.
Unless you're especially gifted or have meditated before you'll find that your mind will probably wander after five our so minutes at best. Just like screwing up your first spell or two, this is normal. It's a learned skill, but is totally worth developing.
Also be aware that some forms of meditation may work better than others for you. If visualization or guided meditations aren't your strong suit, try zazen (sitting and staring at nothing). Zazen too boring? Try Hatha yoga (this is what you think of for "yoga;" sitting/standing in funny positions). Not limber or strong enough for most yoga asanas? Try a moving meditation - popular in Zen Buddhism it involves doing a simple task like walking or sweeping and attempting to be aware of nothing but what you are doing. Those really good at moving meditations will develop a weird/impressive ability to recall several details of their activity, like the exact number of trees you walked past (without actively counting, of course).
So go on and pick a few meditations that sound interesting/easy and a few simple spells and give them a go. Provided you don't do something crazy like decide to summon a demon, you'll be fine. Even if you were to completely fail, worst case scenario would be nothing happening.
We'll be here to help you with problems, answer your questions, and celebrate your successes. :)