Migrating from SAV to SEP is very easy once you have planned everything on how to go about it.
First would be how many clients you have.
How many Servers (Primary/Secondary)
Any Groups Configured with specific policies.
In SEP do wanna go for Replication (Multiple SEPMs)
GUPs,Which database you plan SQL or Embedded.
What features do you need and what are your expectation from this product.
Well if you have a small network
Just go ahead Installed SEPM.Deploy Clients
Remove SSC and deploy SEP on server.