I did something very similar to you. The first day when he got there.. he was really sweaty. Unfortunately, it was a 90 degree type of day. I gave him a light bath.. walked him around.. then put him in his stall with fresh water and hay. I let him be for the weekend. I came everyday just to say hi and spend some time with him. Day 3 came, and I took him out for a lunge. We went slow.. and eventually got on to ride. He came out of quarantine about 2 weeks after arrival. He's settled in really well. He's so laid back.. I don't even think it's bothered him much.
How is your new guy doing? He's so beautiful.