tomato on buffalo router

I want to install tomato on my HP g54 buffalo router for QOS feature.
I have gone through most of the guides on net.
But still would like to know any precautions I need to take as I canot afford to brick it....:ashamed:
Also I noticed a change in the default ip address after tomato update, is going to be 192.168.1.1 instead of 192.168.11.1 (as mentioned in old guides). So how I am going to access my airtel modem which is having the same ip???

pls help
 
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