If you take it slow and easy you can do log planting arrangements without man or plow.
Just keep in mind that you don't want to add too much fill over a living tree's root zone. When planting over those, just a bit of fill around the roots of your perennial is what you want.
Larger log arrangements are possible in open areas
outside of any living trees' root zones (drip lines). Here's an example of a large arrangement, along with pictures to show how it was made.
The thread "New addition to an existing bed" in
Permaculture forum
Carrying logs can definitely throw your center of balance off, however, so please be careful!