I'm not sure if the loader you have is like the later LA352, or not. The process that I learned is to raise the loader high enough to install/lower the loader support stands, and do that. Then tilt the bucket down 15-20 degrees, and put enough down pressure against the ground to relieve the pressure on the loader pins at the top of the rear loader frame. Remove those two pins ( one on each side). Curl the bucket back towards horizontal, and as you do that, the loader will rise out of the rear masts. When the loader is clear of the masts, you can back up just a few inches, shut the tractor off, and cycle the joystick through it's full range of motions. Set the brake, dismount the tractor, and disconnect the hydraulic lines. On some tractors, some of those lines have to be reconnected to the tractor (older BX series) but I don't think that is true on yours. Hopefully, this is enough information to help you out. Look carefully at your loader, and I think you will find enough things that look like what I described to get you started.
Good luck ...
