问:郭某做生意资金不足,向我借款10万元人民币。我要求他把住房作为抵押。他同意了,并将房屋所有权证书交给我。我听说房屋抵押应当进行登记,否则无效。请问,房屋抵押应办理哪些手续? Q: Kwak business lack of funds, borrowed 100,000 yuan to me. I asked him to use the house as a security. He agreed, and handed me the certificate of home ownership. I heard that the mortgage should be registered, otherwise invalid. Excuse me, what should be the mortgage procedures?