Yes, you can absolutely upgrade yourself.
Probably best first read through the migration hub documentation https://confluence.atlassian.com/migration/jira-7?tab:platform=1
Since JIRA has been split into 3 different applications you'll need to decide which of the 3 you will end up installing as the 'latest' JIRA version. (or alternatively, upgrade to the latest 6.4 release and then work out what to do about JIRA 7)
I have multiple projects that use variations of the same base workflow. The variations depend on the requirements of the project or issue type. The variations mostly come in the form of new statuses ...
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