Step 1: Find a computer free from malicious software (a new computer would be ideal, though this may not always be possible).
Step 2: Find a trusted paper wallet generator. For example: WalletGenerator.net or bitcoinpaperwallet.com.
Step 3: Download the files on the site. Once downloaded, ensure that your internet is switched off to ensure there is reduced opportunity for hacking.
Step 4: Open the programme. Generate your wallet by hovering around the highlighted text until the count reaches zero.
Step 5: Your number should be generated, print off the paper (making sure your printer is not connected to wifi in this instance), delete the web page, and store your printed wallet in a secure location.