If you can, extend your sewing table to the left of your machine. Either with another table, or perhaps an ironing board. This will take a lot of the weight of a larger quilt and let you move it around under the needle easier.
I also found that rolling a quilt didn't work for me. My machine is against a wall, and a roll really needs space behind your sewing table so that it can drape over the edge. Now I 'puddle' the quilt under the needle, keeping a flat area by holding it with my two hands spread either side of the needle, before moving onto the next area. There are gloves you can wear with gripping dots on them to help with this, or you could try finger cots. There are also hoops/halo to help spread the fabric flat.
I practiced my FMQ on smaller quilts that I made for Project Linus. I benefitted, so did the kids.