Schools like UC Berkeley and Harvard have “career discovery” programs in landscape architecture (and architecture and urban design) that put you through an intensive bootcamp-type program: a crash course in the software, a broad survey of the methodologies, a sense of what grad school studio culture is like, and you leave with a slick design portfolio.
Worth a look!
http://ced.berkeley.edu/academics/summer-programs/summer-institute/inland/
http://www.gsd.harvard.edu/#/academic-programs/career-discovery/index.html
(Full disclosure: I manage the UC Berkeley summer program)
