What are you worried about (i.e. what is your question)? You have personal liability for the business loan if you gaurantee it, just like any loan, and you are correct that there are exemptions if they try and collect a judgment or you file bankruptcy.
Disclaimer: This answer does not constitute legal advice. I am admitted in the States of New York, New Jersey and Massachusetts only and make no attempt to opine on matters of law that are not relevant to those three States. This advice is based on general principles of law that may or may not relate to your specific situation. Facts and laws change and these possible changes will affect the advice provided here. Consult an attorney in your locale before you act on any of this advice. You should not rely on this advice alone and nothing in these communications creates an attorney client relationship.
The steps you have taken are likely to keep your house but it may not and if you are the one in ten who is not protected, it will be no comfort to you that while you lost your house, nine other people in your position did not lose their house. There are many potential issues that you need to keep in mind. First and foremost,how much is your house worth as a homestead only protects $500,000 of equity. Second, if your wife were to unfortunately die, you become the sole owner of the house. Third, is the lender having you give a mortgage along with the guarantee? Fourth, do any loan documents seek to have you waive your homestead? I have seen too many people sign personal guarantees and not realize the consequences.