Tube Rolling a Rogue Cronus Titan integrated amp

Hi this is my first post so please forgive any mistakes made thanks in advance.
I own a Cronus Titan integrated (Non Magnum version). I purchased this off E bay in the UK  where I live and to be honest it was a nightmare needless to say I had the Amp repaired by an extremely good Electronics engineer so didn't lose out too much financially.
The Amp was finally as it should have been :-)  and I have lived happily with it for the past 2 years, however( as always) the need to tinker has bitten me again so having read a few posts regarding said amp I have ordered a Matched Quad set of Gold Lion KT66's 

Now for the important bit 
I'm not technically minded especially with electrics what if any thing would I need to change on the amp to accommodate the valves as in biasing is usually set @ 35 on the meter( if that makes sense)

Sorry for the long-winded post and thanks for having me