Some build advice:
- Be safe - don't wear socks, stand on a hard floor if possible, ground yourself if you have a wrist strap for that, and discharge any static by touching metal and/or the case before touching any components. And no matter what, DO NOT open the power supply, and definitely don't touch anything in it!
- The huge motherboard connector probably requires more force than comfortable.
- Watch through at least one build guide before starting. That way you know the process.
Hope that helps, and don't let it scare you away - it's really fun to do and if you're careful, chances are nothing major will go wrong.