Are sales and purchase very easy work to do ?

It is easy for a person who is equipped with the necessary skills and most important skill in sales is communication.If you can communicate well with your clients you will be able to put across your objective before your customers.

Not at all. Every profession needs hard work and dedication. There are specific skills which should be present in a person to deal with sale and purchase matters. Communication is definitely one of them. 

Selling your product need a lot of efforts, you need to highlight most of the things, you need to see the needs of buyer, but if you are purchasing something then you will consider the cheap, quality of product, necessary to use etc. A seller is a seller who sell comb to bald person, and a buyer is a buyer, who buy one thing and get two things free of cost. :)

Selling and Purchasing can be easy if handled by professionals, and it can be devastating if practiced in wrong market and without an strategic planning in advance. But it is core of any product and necessity for conducting a business