You need to pick your point on the beach first that suffers least wind & waves (obviously), then I suggest you walk into the water up to knee depth to check for submerged rocks that you might hit the hull off when it comes off the trailer. (or that will impede the trailer as it goes into the water)
Also, you'll be checking for sand bars that alter the elevation of what you are launching into, since you want a nice steady deepening slope all the way out. The worst of all times to launch & recover is whilst the tide is nearly full, as you will have precious little 'hard' sand to work with, and this is where you are most likely to get stuck.
You dont say what you are using to launch with, if its a tractor .. your sorted
, if its 4x4, you need to be a lot more cautious, your biggest problems are really traversing soft sand, in that if your rig is heavy, and your wheels are small, it wont roll easily through soft sand, and produce a lot of drag to the towing vehicle, the next problem, is that you will probably have to go into the water further, as the beach may
not be as steep a slope as the slip way you are used to, meaning the vehicle will get wet with salt water.
Watch the wind when you recover too,.. its easy for a wave to lift the hull a little and shift the boats position as you are trying to get it on the trailer, assuming your recovery trailer has a winch, make sure the drill is practiced, and perhaps a second body is advisable to winch like the bejesus whilst someone else holds the stern steady