Hey,
The airbox comes out first , if you can’t do it sideways
The injectors are held down by a plastic cap that has a fuel pipe sticking out. The plastic cap itself screws in to the metal body of the throttle bodies
Gently but a firm grip will pop them out! (only after the plastic caps holding the injectors down is taken off)
If it helps , please take a picture and post on this forum so we see how far you have gone ?