update setup instructions

Author: tylerdave

PREREQUISITES.md

@@ -105,18 +105,21 @@ http://editor.swagger.io/#/
 Recommended
 -----------
 
+In order to test the API implementation locally, you should have a tool for 
+making HTTP requests. You are free to use any tool you are comfortable with. We
+recommend Postman for this purpose if you don't have a strong preference.
+
 ### Postman
-In order to test your local application you should have a tool for performing HTTP requests.
-You are free to choose any tool you find comfortable and we recommend using [Postman](https://www.getpostman.com/)
 
-If you choose to use Postman download the version for your OS from the above link. A handy option is
-to use the Chrome extension.
-After downloading and installing Postman if this is your first time using the tool we recommend
-getting familiar with at least these two guides:
+Postman can be installed as a native application or a Chrome plugin.
+
+Get Postmane here: [Download Postman](https://www.getpostman.com/)
 
-[requests](https://www.getpostman.com/docs/requests)
+If this is your first time using Postman, we recommend using these guides in
+order to get familiar with the tool:
 
-[collections](https://www.getpostman.com/docs/collections)
+- [requests](https://www.getpostman.com/docs/requests)
+- [collections](https://www.getpostman.com/docs/collections)
 
-Some of the exercises will contain a file named postman_collection and those will help you complete
-the exercise more quickly.
+Some of the tutorial lesson directories contain a file named 
+`postman_collection`. These will help you complete the exercises more quickly.

VM.md

@@ -11,6 +11,12 @@ You can check the status of the VM by running `vagrant status` from within
 the repo directory. If it is not already running, start it with
 `vagrant up --provider virtualbox`.
 
+### Keep Up-to-Date
+
+On the day of the tutorial, make sure to `git pull` the latest updates to the 
+repo and then run `vagrant provision` in order to make sure the VM has the
+latest updates.
+
 ### Logging In
 
 You can log in to the VM using `vagrant ssh` on the command line or by
@@ -25,6 +31,13 @@ start it again using the commands above.
 VM Tools
 --------
 
+### Shared Directory
+
+Vagrant is configured to map this repo directory to a directory called 
+`tutorial-repo` in the ssh user's home directory. This will allow you to edit
+files on your host machine using your preferred editor while also being able
+to edit and validate them while logged-in via ssh. 
+
 ### Swagger Editor
 
 Two versions of the web-based [swagger-editor](https://github.com/swagger-api/swagger-editor)