Do not worry, manufacturers do not expect you to jump into the bed of your truck to construct these types of tents. As you would with a traditional version, you can erect the tent directly on the ground. Once you have conquered that step, you can then carry it over and place it on the bed of your truck. Most are lightweight enough for you to do this by yourself, but you may seek assistance in this area. From there, you simply attach the straps and buckles to the underside of your truck (depending on the type of tent you get).
While assembling it on top of your truck will skip the lifting step, it will make the process insanely irritating and problematic. Do yourself a favor and stay on the ground until needed.