Hi Neha
I use tweezers to do my eyebrows, much cleaner and easier for me. I do every 5 days, so do not allow the excess hair to grow too long when tweezing becomes a struggle.
For upper lip and chin, I do self threading. Just very easy - buy the thread spool from any beauty shops, take a length of it, knot it on one end and twirl the other end between your thumb and first finger and do the scissoring action as done in the beauty parlor. Nair's facial wax strips have not worked for me, probably my growth is thicker than normal