Best advice is work with someone experienced for a while, assuming you know how to access the task is key (Type of tree, the size of the stump, weather, weight, the lean, the hinge wood, , your escape or protection position etc. Ropes and jacks whole story in itself). Then put a plan in place, also plan B if things don't work out (what are you going to do, do have enough equipment to place plan B). My advice whatever you do on plan B. "DON'T CUT MORE HINGE". Even in the best situation things happen quick where things aren't prefect. Everyone who falls at times questions some falling situations, problem here in PNW it's all about the lay so experience is key. Even experienced faller things don't go perfect. The direction of fall sets the face cut, is the face clean, from there the assessment is going set the plan on the back cut. It just depends on how much stump you're working with, the type of tree... the lean, do you need to turn it so it not easy to explain what a faller looks for. For me I watch a wedge placed in the back cut kerf or just plain watch the kerf. I don't look up until it starts to move, I don't see the reason unless there is hazard to watch... I'm more worried about it setting back and where my bar is. I always stop and check my position of my bar as I approach about 4" from the hinge on larger tree. How square is my handlebars, I set them as my reference as you approach a critical hinge. That saw referance is going help keep the hinge on it's line. Smaller trees I plunge cut in the hinge, if wedges are needed there placed. Again, plunge cut have their issues too! If you don't have room for your bar and wedge or the wedge is going, be up against the hinges those situations are all in the plan before any cuts are made. If you have room for you bar and wedge and the lean is back tighten up those wedges move the tree forward before you cut the last few inches before the hinge is placed. Without a good assessment or plan once you start making the back cut your just put yourself in dangerous situation if your plan isn't working. I just think there are too many variables to explain what to look for if I understand your question correctly. Once the tree is going... my eyes are on the top, do I nip off one side of the hinge or exit to my protection. Regardless... my point is don't assume from reading advice ... you known... take it as perspective. By the way I'm not good a faller so "don't put a lot of value on this context". My Dad is a good faller and I been around good fallers and I don't kid myself as being one. My dad has been falling timber since he was 12 and was on his own at that age. He didn't work had no place to sleep or anything to eat. I started falling with him when I was 10 but mostly bucked, skidded or set chokers or sat with the whistle punk. I think your question can be taken many different ways and I don't know your experience, but I do care that you keep yourself safe. Remember it my perspective for "thought" not advice on what to look for!