Welcoming a new horse, whether it be your first or your tenth, can be an equally exciting and worrying time.
Regardless of age and experience, moving to an entirely new home away from all that is familiar - routine, companions and surroundings - can be very stressful for horses. It may take weeks or even months for them to truly settle in. A change in behaviour is quite normal and they may seem very different to the horse you first met or trialled.
To help them adapt and settle in, the routine they have been used to should be maintained as much as possible. i.e. similar turning out and bringing in times, or living our 24/7.
Some yards may have a quarantine procedure that you have to adhere for the safety of the other horses on the yard. If their management changes dramatically, this is almost certain to cause stress.