First get the drawings and see if there are any post-splicing assemblies, such as head and body, body and feet. If yes, ask the seller to change the drawings. After the blocks are connected in series, it is not easy to splice.
2
Don't spell layer by layer, you can spell string by string, preferably on a flat surface.
three
Don't worry, if some buttons can't be connected, try a few particles and patiently spell out the complete Lego.