VirtueMart looks awful with my Joomla template - how to override?

[Lisaweb]

I am so confused about how VirtueMart templates work.  I've tried searching the forum but still don't understand.  I have a beautiful 2.5 Joomla template, and I installed VM 2.0 but VirtueMart doesn't display correctly at all within this Joomla template.  It's a mess - fields missing, layout skewed.   

How can I override the Joomla template and get VM to display correctly? 
Do I need to install a VM template? 
If so, is there a default template I can obtain somewhere?

Thanks for any help you can provide!

[chancehoggan]

You need to copy a few folders/files to the html folder inside your template folder.

http://docs.joomla.org/How_to_override_the_output_from_the_Joomla!_core

[jenkinhill]

@Lisaweb I hope that by saying 2.0 you actually mean 2.0.10

Some all singing & dancing Joomla templates have so much JavaScript and multiple css styles that it can be a problem to get VirtueMart to function & display properly. But these issues are rarely insoluble. The use of overrides and editing/adding VM specific css can make a theme that matches the template.

http://dev.virtuemart.net/projects/virtuemart/wiki/Hints_for_the_use_of_the_template_system

[Lisaweb]

Thanks Jenkinhill & Chancehoggan for your suggestions!  I will study over these pages and report back.

Thanks again!
Lisa