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Q:

how difficult is spark plugs replacement? on 2008 Lexus GS350

Rookie cbe0621eac06868b3efe0d8d1d3611e23c60d3114864ea2ec19a68cfbd3eebab
I wonder how difficult it is to replace spak plugs. Can I do it myself?
(1) Answer
It really depends on how much work you have done on cars, if this is your first time, well that is a VERY EXPENSIVE engine to learn on, so if you cross thread a plug, are you willing to pay about $3000 to fix the cylinder head? If so, then go ahead, if you feel uneasy, pay the 1.5 hours + parts to a Technician to do the job and let him/her take on the responsibility.
Hope that this makes it clear.