there was an easy method of RNA extraction. you can see the attached file .

i perform it with some modification (by using RNX-plus ) 

Trizol methhod

Trizol would be the best method to isolate RNA from any tissue. But if your tissues contains fats, then go for RNA lipid tissue kit from reputed suppliers of mole. bio regents. For ex. Qiagen 

I think TRizol is most efficient, fast and easy method. good luck 

TriZol method is easy and best ..

Trizol reagent

Use trizole-chloform method. that's the best.

It depends on the tissue and the principle behind the extraction procedure, so i think it is better to be more specific about the sample type and possibly the intended downstream applications for the RNA.