[Water Warrior 2]

Welcome. Good call on the old tires as it is better to be safe than sorry. One wheel at a time is probably safer. Hint: When removing front wheel leave bike in gear, when removing rear wheel wrap some velcro around the front brake lever. You have less chance of the bike rolling. Oh......when the front wheel is off do not even think of pulling the brake lever as bad things will happen. Put something handy between the grip and brake lever as a precaution. Also a good time for inspecting brake pads and linings.