Anyway, after that, your cpu would have a slight shine on the top so you know that all the gaps are filled with the paste. Then you can apply another layer of the paste on. This is the proper layer and spread it evenly on with your finger in the same method aforementioned. Careful never to put too much, you cpu doesnt need that much and more risk is associated with the paste leaking off the side of the cpu (especially if it gets hot later).
Initially the paste will take some "running-in" time. As in it has to be cured. After 3-4 days of running the PC, only then will you get reliable readings for the cpu temperature as only then will the thermal paste be working optimumally.
I think that's the best method to install thermal grease - Hope that helps you!!