Just got some dates I requested that no longer works with my schedule. Some Q's:
A) is it hard to switch dates?
B) whats involved?
Thanks from a new Sierra Hikerwww.hikinginsocal.blogspot.com
Yes it's hard to switch dates. You effectively are in the same boat as those who did not get a reservation. You have to check online for open slots and reserve one.
Separately, you can decline the date you got. You do that online during April. If you don't, it will be automatically canceled at the end of April. On May 1, all the non-accepted become available, so you should be sure and check what is available then.
And on April 1, the un-used lottery slots will become available to be reserved online. So you can start looking now at what is available.