Be sincere and geniune. The product really should sell itself. If it doesn't, then you should believe in the product to encourage the sale. If you don't believe in it and you wouldn't buy it, you can't expect that anybody else will.
For my job, I had to sell hair product. Mind you, it is a difficult sale considering a bottle of professional hair product costs about $10 and you can go to Walmart and buy one for $2. Think of the benefits and realize why it is a good sale. If you are geniune and sincere, the results will come!