Convert Wordpress Database to Joomla

Hello there-- I'm preparing to convert a website from Wordpress (Simple Press Forum) to Joomla (Kunena). The wordpress database currently has over 600 members and 3000 forum posts; the membership records will need to be relocated to Joomla and their forum posts will need to be transferred as well. It should not be difficult for anyone with experience in SQL or database design. The person for the job will need to have the highest level of integrity as they deal with sensitive passwords and email addresses. I am looking to have this done as quickly as possible; if awarded, I will send you database access details.