Plays Well With Others...
I refied way way back in the day (1998). I used the same lender I had for my original loan and just got a lower interest rate. My lender was Countrywide and they were great. I never had an ARM though so I don't know what is involved in that. Basically, it's easy to do and you just have to shop around the different lenders and find the best deal with the lowest cost. See if they'll roll your closing costs for the refi into the new mortgage. Good luck. I would totally recommend doing it because I am sure you can save some money in the long run.