If completing a structured course manual loadsheets aren't that bad. Its all in the preparation. Look into all possibilities that may occur during turnarounds. Consider pax distribution when loads are low, cargo changes, dangerous goods segregation, no show pax, increased bag figures/volume.
You wont get it all cleared overnight, however take things one step at a time. Soon enough, you will develop a skill that will help you much more when using a computerised system.
Oh yes...if doing live flights..take a spare clean copy with you in case you need to start again!