How to transfer all of my data and photos from my iPhone 4 to a new iPhone 6s?

I'm going to be getting a new iPhone 6s after all this time soon. I want to transfer all of my data and photos over to my new phone, instead of having the store do it, because I feel like they're going to snoop through my photos, etc. How do I transfer my stuff over to a new iPhone?

Well, first you need a computer. If you don't, then borrow a friends computer or laptop. Then, download iTunes. When downloaded connect your iPhone to the computer. Then click on the phone looking button somewhere top left. When there, click the backup button. If you only wish to backup your photos and other irreplaceable material, then do a normal backup. If you wish to backup every single thing in your phone, then do a full backup. Please note that some new iDevices won't accept old iDevice backups due to conflicting codes.

Well first make sure you backed up all your pictures and all the other stuff on your current phone before switching over, Once done that you should be able to restore all your information onto your new phone

Put all of it on Icloud or save it on icloud then on your new phone log into the same icloud account and it should download all the photos and stuff