1. If I purchase the Installation along with the license, what is the usual turnaround time to have the software installed on my domain?
Usual turn around is same day/next day depending on time of day ordered
You can temporarily change your password but usually we ask for ssh/ftp access and the mysql info. If your unfamiliar about anything link to your control panel and signins will work. Again changing the password temporarily is the easiest way to provide this info and remain secure
3. Once the software is installed, will I be emailed or given a set of directions how to customize the gallery?
Yes you can browse our manual which has basic info and we have support forums for questions on how to operate things as well. Code modification as noted is outside official support but we as suggested might answer easy questions.
4. I host with godaddy.com and wonder if the following meet the requirements to have PP installed:
They should be okay but you can run the phpinfo.php file linked on our requirements page for you to be totally sure. Only less than 1% of servers are uncompatible in my dealings with hosting.