blog Basic Author Blog Post Review Options?

I am looking for a blog review option so a guest blogger can preview the blog post prior to publishing it.  I do not want the guest blogger to have any other access to the back end of the site - just the ability to preview the particular blog post(s) they are contributing to confirm it is good to publish.  Is there a way to password protect an individual blog post for preview?  Is there an option that will allow a guest blogger to only review their particular blog post(s) and not give them access to content from other guest bloggers?

NOTE: Guest bloggers have already been added to the site as basic authors so I can designate each guest blogger as the author of their particular blog post(s).  I considered password protection for a blog post, however, I am only seeing an option to password protect a blog page - not a particular post within that page.  Additionally, I considered giving access to bloggers as contributors instead of as a basic author, but doing so will give access to additional content that I do not want a guest to have on the site (i.e. access to other guest bloggers' posts and content).