if this is your 1st big operation, I would recommend "not to do both at same time" to you .. when I had BAS in April, 2009 , I also had my 2nd nose job & chin reduction same time in one sleep .. after I discharged from hospital, I couldn't get up by myself in the morning for about 2 weeks , my mum had to help me, lifting me up in bed in the morning lol ..
and in April, 2010 , I had very bad car accident, which I had to stay in ICU for 3 days and in hospital for almost 3 weeks, my left leg was broken, fractured tendon in my left index finger, broken right collar bone, collapsed lung and few more on my body (I had to do physiotherapy for almost 2 months so I could walk again). Because of this car accident experience I had been through that's why I thought I could do SRS without any trouble ... therefore last year in September, I decided to have SRS with forehead implants/countoured/shaved at same time .. which was nothing compared to my car accident experience.
good luck with your decision ! 😉