Pretty easy to change out. Disconnect the battery. Locate the fuel rail's shraeder valve (looks like a tire valve). Take a rag, and depress the center thing like you're letting the air out of a tire. Might want to wear eye protection. Collect the gas spray with the rag, and throw it on something you don't mind bursting into flames. If you wait and do this first thing in the morning before driving, there will be no gas pressure.
Next, if you have the plastic fuel rail, you might consider switching to the stainless at this time. Pop the 8 individual lock tabs up, and pull the rail off the manifold. You may need to disconnect the fuel rail to fuel line connectors.
Remove the injector electrical connectors (squeeze down the wire tab and pull off), and take the rail and injectors to some place you don't mind being doused with gas and/or on fire. Outside is good. Tell people not to smoke.
Next take a flat tip screwdriver and pry off the injector retainer clips. Then pull out the injectors. Install new ones with NEW o-rings (you DID buy some, right?) into the fuel rail. Install the retainer clips. Give the injectors a good pull to make sure they won't shoot off if you installed the clip wrong. Adjust or reseat clip if necessary, and repeat until it's solid. Reinstall fuel rail and seat the injectors into the manifold.
Once it's back on, reconnect the battery. Get in the car and turn the key to run. Hear the fuel pump kick on? Turn the key back off. Wait 10 seconds. Do it again. Repeat a couple times to get the air out of the fuel lines. Check under the hood to make sure you don't have any leaks. Then start it up.
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