Accessing sudo from a non-administrator profile

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http://askubuntu.com – community, :) I have a question which has probably already been asked in different forms, but I may not have understood the answers completely... bear with me :( I have had Ubuntu for a few months by now, and I have set up an administrator profile + a 'normal' account which I use for everyday work. Sometimes I need the admin profile, e.g. to install programs. This means that I have to switch profiles, execute whatever commands I need with sudo through the admin profile and then go back to work. This is rather uncomfortable, as sometimes I have got open web pages with the instructions of what (HowTos)