Tail-log backup options when restoring to a new database
I'm restoring to a new database and don't want to mess with or interrupt the source database at all.
  
  So should I leave the options under Tail-log backup (Take tail-log
  backup before restore and Leave source database in the restoring
  state) unchecked or checked?


Unchecked.  Just enter the name of the new database you want to restore into and pick the point on the timeline.