Migrating data from Salesforce.com to Zoho CRM Enterprise

Migrating data from Salesforce.com to Zoho CRM Enterprise

I would like to use Zoho CRM Enterprise. But I've got 6000 leads in my SFDC Enterprise account.
 
What is the most effective way to pre-customize my Zoho CRM account? And no I can not afford consulting fees so I've got to do this myself. In theory there is a SFDC to Zoho CRM migration tool??? 
 
What works, and what gotchas do I need to keep my eye out for?
 
TIA
 
GaryE