For me I make all my patterns in AutoCad, such as sizes of front and back, stitching lines,...etc. Then I transfer the pattern to photoshop to scale. In photoshop I made custom bruches for flowers, roses, leafs and some shapes. I just set my layout by putting all flowers and other elements in secounds, I can then rotat, flip and scale anyone.... I use my tablet pen to draw all scrolls and vines... at last I print it to transperant paper. If the drawing is bigger than A3, I print it in sections and tape them later... I just starting to use a projector that been hanging from my ceiling. so I do not need to print my drawing in section, I aim the projector to the leather piece., I tape the leather to my bench to prevent it from moving then I trace all lines using a stylus... and believe me I'm starting to like this method alot...