Namaste Jai:
My feeling is that any prayer to Lord Śiva can only create benefit!
You wrote about your past veg diet being too carb-heavy, and yes, this will certainly make a vegetarian lifestyle harder, with too much quick energy from sugars and not enough grounding from good fats and proteins. Learning different preparations of vegetables and taking more vegetarian protein foods (like dals and nuts, and curd and paneer if you take dairy) will surely help you succeed. Vitamin B12 is also vital for keeping your spirits high and your mood stable, so it's worth taking a supplement for this important nutrient if you don't eat many B12 foods (e.g., tofu, soymilk, and cheese).
What pleases me most about being vegetarian is that I no longer feel guilty and hypocritical about my meals; I wasted so much energy on stress and worry and feeling bad about myself, but now taking food is simple and even joyful. Instead of focusing on what you are missing, it might help to think about how good you will feel when your deeds align with your wishes and beliefs. I wish you best of luck in your efforts (and am happy to provide recipes and advice if you'd like to PM me).
And one more bit of "food for thought": believing yourself "tongue-tied and stupid" in prayer is perhaps a thought originating with ego, no? We don't laugh at children who are learning to talk or call them fools when they misspeak, and Lord shows us even more compassion. Letting go of that feeling of silliness is a part of trusting surrender to the Divine, and one of the most wondrous aspects of performing pūjā.
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