Brian,

Nothing major needs to be removed to replace the injectors. Remove the allen bolt, manipulate the retaining bracket to get it off and undo to fuel lines at the injectors. The fuel lines can be moved/slightly bent to allow the injectors to be pulled out. Slide the old seals off and replace. When you remove them (injectors) look for any signs of leaking. Don`t expect great improvements, the old injectors are probably fine.

Tinker