I will heed the advice Trials! Thanks!
Ahhh... One of the things I enjoy doing.
I use a grapple to move big rocks now. I used a stone boat, wheelbarrow, and pry bar for a long time.
If you have kinda square or rectangle rocks they work dry stacking. Up to 2-3 three feet high is the norm for these.
Coupla tips. (Or more)
The round rocks stack better with some mortar. (It's easy)
Try to have each rock "flat" in the wall's face. Like this. Your nose on your face projects out. if we used your head and the nose sticks out, try to line each and every rock's outermost projection(nose) up inline. It looks better to the eye.
Leaving a few deliberate "shelves" to put plants or knickKnacks on is a good touch though.
Try to run your lines (courses) level to the world. Not follow the slope. The eye sees it as not looking right. Square rocks the same way. Level tops. Try to level each course with a stringline and each rock with a 6-12" level.
Taught to me by an older gentleman. Rocks are lazy and tired. Try to lay them down like they want to rest for sleep. Builds a more sturdy and solid wall. Try not to "stand them up".
If the rock you just placed still wiggles, you aren't done with it. mortar or chip something off till it lays solid.
Triangle rocks suck. But that's probably the most that will be found around your place if like mine. Tempting as it is don't use them to make a face with the widest side. This is a wedge that the dirt behind will push out on. Turn em around pointy end out and use them for filler.
Retaining walls should be set back each course into the hill slightly. I like to use one inch back per foot up. Also google a tieback and use a few rocks for that.
Dry stacks should be built with the larger rocks on top contrary to what you think to weigh the wall down and hold it in place. Smaller rocks can be pushed off the top layers more easily.
And of course, "one rock over two, two over one." Don't let a vertical line develop in your wall.
Scrape the mortar back from around each rock's face about 1/2-3/4" as it sets. This gives the rocks a better look than a flat brick wall.
Post Pictures!