I like to do BOMs so I do each block as I get them; the rest of the time I cut and label all the fabric, then I break down each step and complete accordingly. If I have 100 FG to make I will grab enough to make 20 at one sitting, trim down label and move on to the next 20, etc. . This helps me set mini goals for getting everything done, I also take a short break between each “round” so I don’t get so fatigued. Usually, my break involves a quick cleaning chore so that nothing has a chance to get too neglected.