Some basic tips on building a PC.
1.) take a 15 minute break every 45 minutes whether you feel you need it or not
2.) Never be in a rush
3.) Save all of your boxes
4.) Having a LED headband like this one can be super helpful and make the process so much easier
http://www.lowes.com/pd_288207-346-HD5L33AE_0__?productId=1081291
5.) For a first time build I would recommend going with a midtower or larger case
6.) Have a large stable, clean table where you can put the build together
7.) Lay a soft thick fluffy towel on the table if you are going to lay your case on it's side to work on it
a.) this will prevent the paint finish from getting scruffed if it inadvertantly gets bumped or moved
b.) it will absorb any rouge screws which may roll out behind it that you don't see. Therefore it sinks in to the
towel and will be less likely to scratch the case.
8.) Make a dedicated time to perform the build and make sure all interruptions are out of the way.
Here are 75 other tips:
http://www.computershopper.com/feature/75-pc-building-tips
You don't need to know all of this to build a case. It is actually quite simple. You just assemble 6 to 8 parts and that is it. If you keep that mind set it will be a whole lot easier.
The forum will always be here to help.