1998 ford expedition?

I have a 1998 ford expedition that I want to change the spark plugs in and it makes me nervouse cause I have heard of many people haveing problems with blowing them and brakeing them off and was wondering if anyone could give me any pointers to help make the job easyer I just bought it and it has 150,000 miles on it and I dont think they have been changed for a long time
 
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