I have 40 websites all running Admin Tools, Not one site has been attacked since we started using Admin Tools, There have been many attempts, but no successful attacks.
The process is simple - Install Joomla then install admin tools.
Its easy to configure and makes keeping your site up to date with the latest versions of Joomla and Admin Tools very simple.
Its a shame I can only give you 5 stars (Excellent!) - It should be 10