Currently SFC training, questions for if I book HND-GMP and a GMP-HND return on separate tickets (on the return I have a separate ticket going further than HND, hence cannot be on same ticket) with 1 hour layover (e.g. HND-GMP 8:45-11:20, GMP-HND 12:25-14:25)

1) If the agent in HND could check-in for me for both flights (won't have checked bags)
2) If the connection in GMP can be done airside without having to clear security / immigration

Thank you!