How do I change the fuel injectors in my 1990 gmc vandura g2500?

when i do change them do i have to recalibrate them or just switch them out. Its a 350hp engine and tbi injection|||There are 5 or 6 Torx bit screws on the top of the TBI unit- pull those out and lift out the injectors. Note: cleanliness is next to godliness in this operation. The new/ reman injectors are plug and play:)