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Selling is simple, knowing when to, is tough.
The act of selling:
To sell your shares, you will need to contact your sharebroker or financial adviser. If you do not have a broker, you can obtain details of brokers in your area here.
You will need to have your CSN or Holder Number, and your FIN when you place your order to sell your shares.
If you have no current broking account and no intention of acquiring other shares, a one-off sale can be made. You can talk to any broker and provide them with the relevant numbers, photo I.D. and bank account details and the transaction can be completed.
When to sell
Consider these points:
The old industry adage that says you sell shares only if you need the money or if your company has changed for the worse. 
It may not be a good idea to sell shares just because they have performed well (and by the same token retain those that have performed badly). Do your homework on the company, on the market and on the sector and above all make your decision objectively based on the company's prospects. Take account of the impact of taxation if that is relevant and significant.
