Very little - it depends upon the materials used for each job. Completing the job to the customer's satisfaction. Sometimes working with people can be difficult, especially if they didn't order enough material for the job, or if they change their minds at the last minute about the installation date. Yes, primarily working with the customers. The work is self-paced, but sometimes there are urgent customer deadlines especially if the materials don't arrive from the factory on time.
Work is done in the customer's home or business, so the work environment varies.
Custom installations where you can be somewhat creative. Most flooring installers are selfpemployed. There is an element of uncertainty in all of this. Good basic math skills and good hand-eye coordination. Work into owning your own business.