I watched a short free class on Craftsy by a longarmer when I first got my short arm (Juki 2010Q on a Gracie frame).
I'm not sure if this applies to your situation but I'll pass it on because it really made a huge difference to me!
The best piece of information I got from the class was to 'staple' the quilt to the leader. This changed my life. Using pins was a nightmare, I kept injuring myself and it just didn't stay. I hated loading the quilt which took forever! Stapling it was an epiphany! Now I can load a quilt in probably 10-15 minutes with 5 minutes cleaning my short arm.
I'm not sure if this is the same gal (since I watched the video awhile ago), but here's a youtube one that I think is her:
https://www.youtube.com/watch?v=eF3Rr4KhTtg
And I bought this kind of stapler on Amazon: (Don't try and use your desk stapler it will drive you batty, you need one that is meant to be held vertically with the swivel that allows you to change how it bends the prongs. You want the 'pin' setting which is outwards instead of inwards for paper.)
https://smile.amazon.com/Rapid-Class...+stapler+90119
Good luck!