3. Dig into her past.
Yes dig into her past, find out everything. If you were to buy a car, a house you would want to know the history of it. If the car has been in a accident, if the house was a grow up. So why would you not dig extremely deep and find out everything whether it hurts you or not about the women you want to spend your life with.
I would go as far as to hire a private investigator let him tail her for a few weeks or a month, let him dig into her history, find out her credit rating, find out if she has a criminal record, find out about her exes, her old places of employment EVERYTHING.
Nothing can be worse than marrying a women then finding out she owes 100,000, has trouble keeping a job, was a former porn startor gasp is cheating on you, I would take these steps and more.