Remember to account for any extra influences when you calculate how much you can expect your solar panels to output. There are some intended outputs specified on panels, but that is only accurate if they are placed in an area that is sunny all the time. Any obstruction from trees or from a cloudy day will decrease the output.
Solar panels are not very easy to install, so you should hire a professional to get the job done. While you will save a bit of money by trying to do it in your own, you do not want things to be less than perfect. Also, you will most likely end up paying someone to come out and fix the mess you made.
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Keep your solar panels out of the shade. It might seem obvious, but your solar panels do need sun. Make sure that you are not installing them in the shade. Trim back the branches on surrounding trees if you need to. Failing to do so could cost you more than half your energy output.