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The devil is in the details so to speak. If you have the time and resources I suggest to do an additional cold backup of all Oracle related files. If this is your very first experience upgrading an Oracle database, test it first before doing it on a production system.
And if don't have space for a cold backup, I have to cross my fingers ! :-)
If you are upgrading from 220.127.116.11 to 18.104.22.168 and if you need to revert it to 22.214.171.124 after the upgrade then refer this to downgrade http://docs.oracle.com/cd/E11882_01/server.112/e23633/downgrade.htm
How To Downgrade From Database 11.2 To Previous Release (includes 126.96.36.199-188.8.131.52) [ID 883335.1]