Don't do this unless you have a very good memory. I tried this and changed only changed two things things to my married name - one bank account and the car registration but it caused me chaos where I couldn't remember what name I had given when 
In the end my husband left me for someone else within a few years so I changed the two things back to my birth name and kept my own name even after marrying DH and having DS. It has made my life much less complicated,
A major part of the reason I haven't changed my name is laziness and resentment that only women have to do all of that paperwork after getting married - (passport, all bank accounts, gas, electric, telephone, council tax, share companies , car registration and insurance companies, credit cards, driving licence, doctor, Insurance companies, mortgage and loan companies, subscriptions, pension companies, Inland Revenue, schools, work, reward cards, shopping and online accounts)
When we last moved I made a list of the people and institutions I needed to contact with my new address and it 86 contacts, all of which had a different process to change address. It took months if not a year to to do them all
I imagine changing your name is even more complicated and have no wish to do that any more often than is necessary and having the same surname as my son in day to day life is of no importance to me at all. It isn't how it works in a lot of countries so I don't really care