Use the selector tool (wooden shovel by default) or the /position command to mark the region that you want to miniaturise

Use /select to select the region

Use /scale selection [value] to scale your miniature

Use /paste to paste the miniature relative to your position

Use /adjust and the adjuster tool (brush by default) to adjust size, position and rotation of your placed miniature

Use /delete to remove the placed miniature from your world

Use /clear to clear your clipboard

Use /scale miniature [value] to scale a placed miniature

Use /tools for a overview of all tools and the items they are bound to

Use /tool get [tool] to get a tool

Use /tool set [tool] to bind the tool to a new item