They are not that hard to change you should be able to replace them in under an hour. Autozone have some popular workshop manuals for free on line once you register (for free) on their website http://bit.ly/autozone_repair_info. There is a company that independent auto repair shops get their information from, this same information is available inexpensively for people that work on their own cars.. The information is year make and model specific, covering repair procedures, torque specifications, fluid capacities and specifications, service bulletins, component locations, wiring diagrams ect.... Alldata is very easy to navigate http://bit.ly/AllData_Repair_Manuals_Online
If you don't know how to change a spark plug, ask a friend..... I would go to autozone and pick up a Haynes Repair manual for your car. It has basic simple instructions.
This is for a 4cyl. Remove the sparkplug wire from the valve cover. Do this 1 by 1 as you might confuse them. Don't pull it out from the wire, grip the boot. Now take your spark plug socket with an extension attached to it, and put it down the hole. make the socket is over the spark plug. Now with your rachet, lefty loosey. Unscrew until you feel that it is unscrewed, now pull it out. The spark plug should be attached to the socket. Now take your new spark plug and gap it. Ask the store on how to do that. The gap i believe is .44 now put the spark plug into the socket Then without the rachet, put it back into the tube. and screw it in by hand never use the rachet as it might strip the threads on the block. NEVER! Tighten to 14 ft. lbs? or tighten using the rachet. Just snug. Dont use too much force now. Put the spark plug boot back into the tube and repeat. Since you're new here, if you have anymore questions please use the search button. As this is the best way to answer your question quickly. *REMEMBER to select the archive option. hoping help.