[SOLVED] Installation of Demo

I love your templates. However, I do not know much about HTML but I am okay with Joomla configuration. Here are my questions:

a) How easy is it for me to install the demo version on my domain? Do you provide a installer and clear step by step approach? Or I have to it one module at a time?

b) After I install a template, say Sport Line, later I want to change to News Line. As there are many module differences between two templates, do you think I can do it without much technical help?

c) I cannot access your Forum to check out installation procedures, as I am not your paid member yet.

d) Can you send me some highlight of the installation process, so that I have some comfort level how this works?

Please let me know.