Hi Tony! Taking over someone else hosting is a tough job and comes with many difficult task.
1. I would setup a new environment to have 100% procent control of the computer I host on
2. If documentation is not enough, that is a warning sign for me to not keep going that path
3. All customers are willing to make changes as long as then have a chance to go down in price for a couple of months.
4. Security is my main task for any hosting and if I am the person who have been setting up the environment then I know it would be secure and there for I can tell my customers that you have the best possible hosting partner.