I did a 130 piece planting job years ago and did it well. However in the month following, we had 19 days of very heavy rain. Things started to show some wilt, mostly because there was a little bit of transplant shock going on at the same time. But when the rain stopped, the customer, against my demands, kept watering the hell out of the job twice a day to make everything stop turning soggy and brown. Then she came after me legally to remove the whole job and replace and replant out of my own pocket. Came after me of course after every single piece on the property had gotten acclimated and returned to being lush and green. She made the demand I redo the whole job while things were showing signs of wilt and I of course refused and told her to be patient while this freak weather passes. Well, as summer showed its face and things returned to normal, she wasn't willing to let go the fact that I stood my ground against her. By the way, her husband is a doctor and his 4 brothers own a GIGANTIC law firm with offices all over the state. She wasn't used to not getting her way.
She never won legally with me, but she cost me a ton of time, tons of certified letters back and forth, tons of stress, and about a grand in assorted costs to keep all my ducks in a row and laid out well for the court room. That was my last planting job. The new fella she hire to come in and critique my work and pull and replant things that were already taking root, got hammered one night after a battle with her and ripped half the planted material out of the ground.
Planting has risks. Even the best job leaves a lot of variables that are out of your hands. You can get people to sign contracts and agree not to touch your work for x amount of time, but in the end, when you aren't around, they'll often do as they see fit, an possibly blame you for a bad outcome. They may not get anywhere, but you end up spending time and money to get them out of your hair. If you aren't backing good money on it, find something else to do.