| Harv as its under the 748/916 section the 749 is probably a typo.
Fitting exhausts is fairly simple especially if you have a spring puller handy.
Fitting the chip is again easy with a proper Eprom extracter but can be done without one, just be careful when inserting the new chip to make sure ALL pins are aligned and go into the socket properly.
Also becareful what your wering and what your standing on as Static can damage the chip. Earthing yourself out before hand is a good idea or use a earth strap.
Kev
PS welcome to the DSC mad house | 
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