Headphones to block out noise, prepare enough work, let some one know that your just going to focus on something for X time, if possible book yourself into a meeting room.
I have made sure I book this alarm for a natural cadence in my day rather than forcing it. Because the alarm comes up around the time that I usually am returning from lunch or a meeting, I am usually still able to make some changes to my plans for the day at this stage. I also make sure that I am always reassessing whether this is still the right time to do this check in, as well as whether I am still ticking off habits that are beneficial to me. It is more important to me to maintain a few small habits that I can use as an anchor for others that I want to add, rather than trying to learn too many new habits at once and getting distracted.