IN MOST INSTANCES it will lower your credit scores HOWEVER may not have much of impact whether or not if you qualify for a loan.
Most lenders prefer not see a person is opening accounts while trying purchase a home. Wait till afer you closed on home keys are in your hands prior applying for any other type of credit
Lynn911 Dallas Realtor & Consultant, Loan Officer, Credit Repair Advisor
The Michael Group - Dallas Business Journal Top Ranked Realtors
You WILL sign something at closing that asks if you have opened any accounts....
Sign yes.... deal goes back to underwriting.
Sign no... you commit Mortgage Fraud which carries various penalties.