Micro rings are quick and easy to apply. Here is a free youtube tutorial video to demonstrate how to apply.
This method usually lasts 3 months, and if the stick hair is of good quality Remy hair you should be able to re-use the stick hair. Never try to reuse micro rings, always use new micro rings.
https://www.youtube.com/watch?v=TpIqu8ACcWw
No heat involved, kind and gentle to your own hair.