Walk in the park! 2 strong backs with minimal mental properties can install that lift in 1 hour, not including electric. I watched it done 3 months ago.
Definitely check the concrete thickness first, and employ proper anchors.
Erect 1 post, and bring it close to plumb. Attach header. Locate second post using header and a level to determine location. Install 2 anchors into second post and hand tighten. Bolt up header and recheck posts for level. Shim as necessary. Finish installing anchors and tighten.
Be very aware those devices put a lot of pulling forces on the concrete, so use proper anchors.