If you don't use portal you can skip the step 3
Step 4 in new 11.2.0 Oracle home uses its own database listener, you need to check the details about the listener specific parameter if any change is needed
The link for Oracle Database Installation Guide 11g Release 2 (11.2) is as following
The document you referred is correct for database upgrade
Hope this helps to answer your queries
thanks for the reply
i ised dbua to upgrade my database it finished and now i have 2 databases (10.2.0.2) which is the original and (18.104.22.168) which is the dbua upgraded, so what do i need to do now to tell apllication to work with 22.214.171.124 by default? do i need to mannualy edit (vim) the context file?