If you have never taken apart a smartphone or similar device, it can be pretty tricky. There is a lot of potential to damage the phone, both cosmetically and its basic functionality (such as breaking a ribbon cable). Some folks are quite skilled at it, and can do so easily. Personally, even though I am decently good with my hands and fixing things, and very good at following instruction, have still decided that I am simply now good at taking apart smartphones, and do more harm than good.
To each his own. But just keep in mind that unless you are very confidant in your skills, it can get ugly real quickly.
This thread will give you some examples of how a do-it-yourself job can go wrong: http://forum.xda-developers.com/show....php?t=1696552
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Phone: HTC One X (AT&T version) Rooted, Bootloader Unlocked, S-Off
Tablet: Samsung Galaxy Note 8 (WiFi only) Rooted