I have a Parrotlet myself! I have a male, named Ocean. I used to have a female, but she became extremely aggressive towards Ocean, and she had to be rehomed. But I can tell you that it is possible to tame a pair of Parrotlets. I did it myself. It is quiet hard, yes. But it is possible. Both Ocean and Jellybean were tame before Jellybean had a severe hormonal problem. But I get updates frequently, and she is doing great. She loves her people, and is beginning to mimic.
Ocean has taken some time to recover from his issues with Jellybean, but he is my sweet baby now. He loves riding on my shoulder, and sharing my food with me. He is very quiet, which is surprising since males are usually more vocal. But I believe he is a "closet talker," because I heard him whistling the other day when I was in the other room.
I know you will enjoy your Parrotlets, because I certainly have!