I figured out to add a shortcut on the home screen. When tapping the shortcut it will turn off Assistive Touch. However it quickly comes back on again :( It's a YF home button.
Why disassemble all these small parts? You risk damaging some of the parts/flex cables.
Just continue straight to the battery removal part after the display/digitizer has been removed. Remember to use plenty of isopropylalcohol to dissolve the adhesive under the battery.