I am trying to setup a private eos for my app, I want to know if there is possible to change the usage of CPU, NET etc in private setup without staking tokens. If YES, then please guide me with the procedure.
You can't just reduce the resources usage if you want to get an alternative and don't have EOS tokens for stake see the REX(Resources Exchange System) in eosio documentation.
Also must watch this video for simple explanation of REX video.
For explanation of different REX functionalities see this blog article