5mg will likely make you feel a bit weird or stoned like weed, with a slight body load. If you are sensitive to psychedelics you could feel something similar to LSD or mushrooms with this low of a dose. I often find that a lighter dose experience is reminiscent of mushrooms for sure.
Work your dose up as you become more comfortable and familiar with how it makes you feel. I think it is a really good idea to start low as you are suggesting. Enjoy!
Welcome to the Nexus!
"In the universe there is an immeasurable, indescribable force which shamans call intent, and absolutely everything that exists in the entire cosmos is attached to intent by a connecting link." ~Carlos Castaneda