1. No problem. Just transferring to the secondary should release enough C02 to displace the air. If you really want to make sure, give the carboy a swirl, and it will release even more C02.
2. The hops will settle to the bottom of the secondary. If you don't put the siphon down to the bottom, it won't pick up any of the hops. If you can tilt the carboy a day or so before racking, and gently lower the siphon tube keeping the inlet just below the surface of the beer, you will lose very little.