A fishing line spool support, line guide mechanism, and kit incorporating the same enables users thereof to transfer line from a spool assembly to a reel assembly. The spool support comprises a spool-bearing portion and opposed rails extending in parallel relation to one another away from the spool-bearing portion. A line guide mechanism rides along the rails and comprises spool interfacing structures borne by a carriage member of the mechanism for interfacing with the opposed rims of a spool as borne by the spool support. Together the carriage member and interface units provide line-guiding stop structure for preventing or minimizing line migration during line transfer.