Is it hard to replace an iPhone 4 CDMA screen?

Traded my iPod touch 4g for one and was wondering

If you have no experience fixing electronics, I would not recommend it. I have seen people attempt to replace the screen themselves and end up knocking chips off the board, shorting out there board, tearing flex cables, missing screws, placing screws in the wrong spot (There are 9 different sizes of screws in this phone.), Ect… Once you learn this phone though, it get's easy. I think my time to change a screen is 15 min, start to finish.

So for any one who has Good knowledge of how to take apart electronics.No, It's not hard.
Otherwise. Yes, it is and I don't recommend it.