If going from a regualar HD to a SSD, I would highly recommend just doing a clean install.
Its truly easier in the long run.
True, it is very possible to clone or Image over, but theres a high probability of alignment issues. Although they can be fixed easily enough, as already stated.
You will not have this issue however later if you are re-imaging a Image of the SSD back to the SSD. Its just HD --> SSD it can happen.
The defrag service does not get disabled. Only the SSD is excluded from Automatic defragmentation.
After you are up and running, run the WEI.
At that point, if you look at the Disk Defragmenter, you will see that it is running as it normally would be.
However, if you look at the section Configure Scedule --> Configure disks,
You will find the only disk included for automatic defragmenting are Spinning dives and the SSDs have been removed, are no longer listed.
While Windows Defragmenter is not good for the SSD, by consolodating Free space can and does help the SSD.
BUT, the only 2 programs I know that can safely do this are Perfect Disk & Diskeeper (with the Hyperfast add on)
I use Perfect Disc Consoldate on mine every 4-6 weeks or so.
I just wouldn't run it often, but when done in moderation, it does help them.