My iPhone 6 has white streaks lines and blue spots, can I fix it myself?
In general, no. iOS devices that come with adhesive seals need some special tools and training to repair.

Most people can work odd jobs, cook meals at home, do other things to get paid for less time and money than taking the device to a repair shop to have someone do the work that is:


already trained
already purchased all the tools
already knows where to get parts (and probably gets them in bulk for cheaper than we can)


That being said, don't let anyone say you shouldn't roll up your sleeves and try to learn / fix / break something. We all start somewhere and it's only money if you break your phone completely. Who is to say the experience you gain now isn't worth using a $45 flip phone for how ever many months it takes for you to save for a new iPhone? (A: not me.)