Transiting at MCT is very easy but I recommend you get a physical paper BP for the return flight before you take the outbound flight, because the guy manning the entrance to MCT transfer security wants to stamp it.
You can get a paper BP from the MCT transit counter but it sometimes takes a while and they work very slowly. Make sure they understand that you just want to re-print your BP not check-in from scratch.
And as you should know, it's all bus gates at MCT until the new terminal is ready and boarding starts almost 1 hour before departure time...