How do I properly update Oracle APEX from the current version to version 3.2.1.?

Question

Oracle

Hello dear developers.

I have tried removing the completely old Oracle APEX in order for it to update it. My version of Oracle express edition is XE11g. And I want to install Oracle APEX version 3.2.1. But these questions arose immediately:

1. Is it true that in the Oracle APEX 3.2.1 interface. Restful Data Services is already built in:

I mean those RESTful services that can be used both to create Web References for Oracle web applications and to create Restful modules (templates, handlers, the ability to see the result of an sql query converted to one of certain formats , of course, at the user's choice (JSON, CSV, XML, etc.) through the browser and / or even download the result of this request as a separate file) to simplify database queries via HTTP / HTTPS request ?

2. What should I check and generally do on my Oracle sql server to make sure that it is ready to update apex to a new version so that there are no conflicts later (most likely due to the remains of resources from the old version of apex) or bugs ( especially critical) was not? I ask you, I even beg you to list the list of actions in this case, what I should do.

I'm waiting for help.
Sincerely
, Dmitry.