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I have been doing that since 2006, although I keep re-introducing poultry. Fish, egg, dairy and poultry modified vegetarian. It's so easy to do given the wide variety of options available. If you want to cut out poultry then you'll need backup food (I like to carry several packs of dried salmon and dried tuna jerky from Whole Foods). They keep fresh for 1+ year or more.
There was as study done not that long ago that pointed out people who ate beef and pork lived shorter lives, and people who ate white meat (fish, chicken) lived longer, so let that be something to give you further encouragement.
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