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Do you have a model number so we can better assist you ?
ES300 Control, Self-Cleaning Oven with Sealed Gas Burners
Model # XXXXX
Does this part need to be installed by a repairman or can I install it myself?
If your real handy you can do this yourself. theres only a screw on the top that runs through the main burner pipe number 1. and the burner tube. theres a rubber seal on the br=urner switch and the screws to seal it. just make sure you dont cross thread it.(the pipe also.) get some dish soap and mix it with water to test for leaks after its installed. you have to shut the gas off when installing. heres a link to all the diagrams.
http://www.searspartsdirect.com/partsdirect/part-model/Frigidaire-Parts/Range-Parts/Model-FGF366EMD/1428/0124002?pathTaken=&prst=0&shdMod=FGF366EMD if your not comfortable plaes call a tech.