Make sure everything is in time, the slighest tooth off and the motor will take a kick harder than you think.
The easiest way is to leave the tensioner loose, and slowly edge the belt onto the IP, Cam, Crank and Tensioner....
Make sure the belt is tight, a quick way to check, is by taking the belt by your fingers and checking to see how flexible or how much vertical movement the belt will have ( this is hard to explain). as long as it is with a 1/4 " then you are good........
start the car with the timming cover off and make sure it is ridding straight, no wobble and no flapping belt's ( lol if they are flappin the motor is prob done), check the belt for marks, chips, holes, etc and if it looks ***e just change the belt for piece of mind.
Also make sure the cover for the timming belt does not have any sharp edges, over time this will cut the belt and well..... Crunch