You will most likely be very sore, but that should come as a ‘wow I’m using my muscles again’ rather than thinking that this training is too hard. If a person of the same age, weight and gender is able to handle CrossFit at its highest intensity, then you should be able to handle a workout at a lower intensity with lower loads and volume. Drink lots of water and KEEP MOVING! If you wait too long before coming to your next class, you will just start the process all over again. Honestly the best thing for sore muscles, is more exercise to move those muscles again.