Alas, I also struggle w/ Inkscape. I have determined that Inkscape seems to require more determination to learn than I have given, so far. Try Youtube videos teaching Inkscape, with the "union" command. There are folks there that teach this subject to share their expertise in Inkscape. Steve does not claim such expertise in Inkscape. Also you might try looking into Facebook "groups" targeting Inkscape. Have a great day. Regards > GLC in Cypress, Texas.