Update:
Diet
I have not had a huge problem cutting out meat. Last night, I had enchiladas containing beef and chicken from a restaurant. That was the first meat I'd had since a week before when I finished off a bag of beef jerky, which was itself the first meat in about a week. So, I've basically reduced meat intake to once every 7-9 days in the past four weeks.
Dairy has been more difficult. I've had heavy cream in my coffee a couple times (basically just trying to use it up since I already have it), I've had frozen custard a few times, I've had cheese a few times, I had eggs and butter in the form of brownies and cakes that I baked, and I've been using up the last of my whey protein powder. Lately though, I've been having small amounts in candy via milk chocolate. This will take more work to cut out.
That said, the majority of my meals have been Life cereal with almond milk, rice with broccoli and/or baked potato and/or okra, salad (kale, spinach, celery, mushroom, strawberry, oil/vinegar), and peanut butter and jelly sandwiches. I have had an issue with not feeling satisfied, even if I am full, especially after just a salad, so that's when I will supplement with PB&J or PB and celery. Beverages have been water, coffee, tea, almond milk, and the occasional energy drink or Wild Cherry Pepsi.
Effects
As far as effects of the diet, it's hard to say anything for certain. I've been dealing with some chronic pain in my head/jaw/neck for years, and, since I started treating it in December, I've had some ups and downs. During this diet, I've had one of the worst downs (my first time catastrophizing pain, I think) and one of the better ups immediately following it (without needing meds to bear it). No idea if this is diet related; however, I have experienced similar things when doing water fasts (every old injury ever hurts severely for a day or two and then feels better than it did before, for example).
My stomach was also feeling really crappy at the start of this, but that had started beforehand and was probably a continuation of something unrelated. So I won't attribute any of that to this.
This may be venturing into TMI territory, so avert your eyes now if bothered by such things: tooting has increased and normal bowel movements are perhaps slightly easier, but there has been some diarrhea-ish activity. But I'm pretty sure I have IBS, which is triggered by caffeine consumption, so again it's hard to tell if any of the good or any of the bad is attributable to the diet changes.
Ultimately, more data and stricter adherence needed to form any conclusions.