Changing the spark plugs is not technically difficult. I believe the 2000
Sienna has a coil for each plug so remove the coil, remove the plug, and
reverse the process.
The difficult part is reaching the spark plugs on the back side of the
engine. You will need a ratchet, spark plug socket, extensions, a universal
joint, and the ability to do lots of stretching and twisting to get back
An old trick to getting spark plugs started when re-installing them is to
get a one or two foot piece of vacuum hose that fits tightly over the top of
the spark plug. You hold on to the hose and twist it to get the spark plug
started. This method greatly reduces the likelihood of cross-threading and
allows you to reach into tight spaces.
I recommend using OEM plugs from your dealer.
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