As business owners, whether sole operators like many here, or a national company with a fleet of vehicles, we have a duty to ensure our vehicles are in GWO.
By deliberating what to do and how to do it, you are putting your own life, along with little Johnie and his mom who will be walking to school tomorrow morning along the very road you will be driving down, at risk.
Get it done NOW. The consequences are so much greater than a delayed or lost lounge/dine H/S/L.
We do have a duty of care too. For example, your liabilty insurance wouldn't cover you for negligence on a bodged vehicle repair, incorrect torque settings etc. etc. but a mechanic's would.
I know it hurts the wallet, but in the bigger picture it pays to be assured that work is done to manufacturers specifications.
SAFE and happy cleaning

Ken