Difficult when you're first starting out. Do not rush for their benefit though. If they honk, you honk louder. Their groceries cannot be as important as what you're doing. If you're that new id avoid backing off the street and just circle the building if you made it happen last time. When you get about half your trailer past that wall cut in towards it then when you know your tail swing wont take the wall out cut back towards that entrance about as far left you can get. Go into the street if you need but be careful. Should set you up between a 22.5-45 degree back. Honk before you start backing then honk every 5 or so seconds. If you see any movement in your mirrors that wasnt caused by you moving the truck stop and honk, if you dont see them clear behind you then GOAL. Good luck, be safe. The first year is the hardest, props to you for being humble enough to make a post asking. Dont like pride take over while doing your duties. Like someone else said, bully the four wheelers as much as necessary to complete the job safely.