I've eaten plant-based for extended periods of time on multiple occasions, and found great success with it. There are a few considerations I would suggest if you're looking to go plant-based:
Pin-point why you are making this change, and what you hope to acheive out of it so you can aline your lifestyle accordingly.
Don't make the switch overnight. You and your body is accustomed to a certain way of eating, so make the change gradually i.e. remove red meat, harsh forms of dairy, white meat, eggs, fish, less harsh forms of dairy (such as yogurt), etc. - over time.
Consider where you will source your protein. As you phase out animal products, careful planning must be made to meet your protein requirements. Find a good vegan protein powder, stock up on your grains and seeds, find some "go-to's" that you enjoy, and track your intake until you are confident you are meeting your requirements. Be cautious of "vegan" alternatives, as many of them are highly processed.
Gradually increase your fiber intake, because undoubtedly it will go through the roof, and too much too quickly will lead to digestive issues.
Supplementation: The supplements you may like to consume depends on your nutritional intake, and this is something you should certainly research further. Outside of my usual supplement routine, I consumed a vegan multivitamin which worked great for me.
Find go-to food sources and snacks, and learn how to cook some go-to meals. I caught myself spending far too much time walking around shops when I was plant-based, because I either wasn't prepared with food or hadn't found any go-to's yet - fixing this was a game-changer for me. It also took some time to learn how to cook vegan food and do it justice. Enjoy this process, experiment, do ample research, and it will pay off in the long run.
A lot of junk food is plant-based, don't fall into this trap. I know I did at times. Think about point number 1, why are you making this change? If it's for your health and wellbeing, switching to foods that are heavily processed (including many "vegan" alternatives) and foods high in refined sugar do not line up with this goal. Stick to whole natural foods for the majority, and treat yourself as you would with any other choice of eating.