Installed my 550cc injectors. Pretty easy straightforward install.
Unplugged the fuel pump and started the car till the pressure was down.
Take the covers off then I use vise grips. You can even use a napkin or paper towel or cloth to cover the plastic. Pull straight back don't twist them out. I know it feels like the right thing to do and have done a lot of research on taking injectors out. Even as far as putting them in the oven but I really don't want my house smelling like gas or have an explosion. lol.
Voila!!!
Now for the new injector. Set it in there don't hammer or push it in there. Get your injector cover with the bolts and tighten them going back and forth between them as shown below. Make sure when they are getting tight they are seating properly. Look at your other injectors for reference.
Repeat the above process for each one. Plug fuel pump back in. Turn key but don't start it immediately. Listen for the hiss in the front and wait till fuel pump kicks off in the back. Make sure that hiss isn't fuel pissing out too. No problems started right up but you get the idea.
Peace.