I used to have a 4.8 - brilliant boat and taught me a lot - you will give up before it does. Have now upgraded to a 5.85 owing to wanting a smoother ride at my age.
My main tips for launching are:
Don't forget to put the bung in (although I think the very new ones don't have this luxury)
When launching down a slip don't rely on the winch strop alone - use a rope through the D-ring tied to the trailer winch post. I have seen a few boats end up on the concrete because the ratchet on the winch slipped.
Where are you launching from?
Peter (nick, nick) T
Age and treachery will always overcome youth and skill! Bullshit and brilliance only come with age and experience.