I use the Kapton tape. I cover a wide area and then take an Xacto knife and cut out around the parts I want to remove or install using the hot air wand. It is interisting to see a part that you use the paste and hot air on just wiggle its self into position with the right ammount of heat and air.
Sometimes I use the solder paste for that and sometimes a very fine tip iron. It just takes some practice to learn how much heat and air flow to use on the parts. As I am just a hobbiest I find the $ 80 hot air rework stations on ebay do decent job. Same as the Amscope $ 200 microscope. Now If I was making a living at it, the Mantis and a $ 500 or $ 1000 hot air station and even one of the hot plate things would be the way to go.