Could i change my iphone screen?

I was just wondering is changing a screen really that hard and does it take any real skill

It takes loads of skill and patience! But what i would do personally is a google search on phone repair stores in the local area and then get a quote for them to do it.
When i owned the iphone 4s i broke the screen and did the exact same thing and found a repair store in my local area that supplied and fitted the screen for £50 which was a bargain considering apple were charging about £180 fitted.

Honestly if you just watch the videos on YouTube and buy the stuff you need off of eBay you should be fine just be careful cause you can easy to lose a screw or break something but no skill just be careful