And so my transition to eating zabihah has been relatively simple. I haven't decided to wholly exclude non-zabihah meat from my diet, but since I almost always eat at home, and when we go out there are almost always zabihah options, the occasion when I don't eat zabihah is pretty rare.
Since I have been on a high protein diet of sorts for several months now, you might think that choosing zabihah might have been harder--since I actually eat quite a lot of meat. But alhamdulillah, it has been incredibly simple.
Partly this is because my husband and I have a tacit grocery arrangement--usually I will buy all the other groceries and he will buy the meat for me. I've not yet gone to the halal meat shop (I should soon, to feel comfortable going there) but my husband has been able to find for me any cut of meat I wanted, ground beef and chicken, plenty of boneless skinless chicken breasts, and even halal turkey bacon. And as long as my husband takes care of the meat, making sure I've got whatever I need, I haven't felt the need to make any major dietary changes by switching to zabihah meat.
Also, I love seafood in general so it's not a problem for me to enjoy seafood entrées at restaurants if zabihah is not available--although my husband and I usually, if we do eat at a restaurant, opt for halal shops run by Muslims.
One of the few exceptions is when we eat on the road, and "fast food" is the only option. Because of the diet, it's important for me to have lean proteins, but if we pass a McDonald's or Burger King, the only fish on the menu is a fried filet. And while my husband will take that option, I find it healthier to order grilled chicken. Though I do usually pack snacks and meals for when we are on the road to avoid this occurrence most of the time.
Since the vast majority of my meals (I'd say all but one or two in a month) are zabihah, I feel like it would be relatively simple to decide to entirely restrict my diet, but I haven't done so. It has felt like a healthy and easy transition at this point, rather than an unforgiving change I might give up. Certainly, everything I cook and prepare at home is zabihah, and I know now that sticking to zabihah can be relatively easy (at least, as long as you live in a place with plenty of Muslims who demand zabihah and halal options.)
So rather than ever suggesting that someone make an immediate change in this regard, I'd say take it easy, and get there gradually. It can be easy.