I use the option in Octopi, with only being 2 months in myself and not ready to build packages ... go to Tools in the menu bar, then Options. Select the AUR tab. I choose 'Yaourt' and '--noconfirm' ... then any AUR package builds itself; you just need to choose/confirm/provide password.
If you want to use trizen, search in Octopi for 'trizen' and it's there, in the main repo.