I was about to post that same YouTube video Lisa! HA! It's just the only one I could find that actually shows someone picking the DBs up before they begin their bench press. (Wow, there are a lot of bad db bench videos on YouTube!)
Here's a written description of how to get the DBs to your bench and set-up for the bench press:
AST Sports Science - Exercise Execution - Chest Training
To carry a preloaded bar to your start position, just brace your core tightly and carry it close to your body--no weird twisting or flexing your spine into unhealthy positions. If you can lift it, you should be able to carry it to your start position.