How difficult is replacing a timing belt and water pump for a novice
Very. Not recommended unless you've done other MAJOR work on an engine. Getting the timing belt wrong and running the motor can destroy it. I believe you have an interference type engine, meaning that if the timing is off enough, the piston and valves will come together, and not in a happy way. I'm talking destruction like your wife coming home and finding you with her sister.
If you have a few hydraulic floor jacks, a fairly large air compressor and tools, seal pullers, probably a lift, and a good Haynes manual (if available for your vehicle), then give it a try. Even the dealership will need at least half a day to do this job, if not longer.
So for a novice, I'd avoid it. Something as critical as the timing belt, I'll leave to professionals.
SOURCE: How do I replace the timing belt on a 2007 Odyssey?
it is quite tough job for beginner but if you properly marked the position of the top dead centre, position of the pulley etc, it should be ok. remember any slight movement of the pulley will cause the engine to run erractically or cannot start at all.
Yes it is recommended to change the water pump, pully etc. as you mentioned
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