Is it hard to learn to be a Vertica user? Admin?

Free classes to learn how to administer Vertica, including certification.

To be a user it is easy because all you need to know is SQL. To admin is also easy with a friendly GUI called Management Console. Vertica Index called Projection can be easily created automatically via a provided tool called Database Designer. In addition, in most cases when you define a column sort order in the CREATE TABLE statement, the default projection is good enough, so you don't need to create any index manually.