About how much would it cost to get diomonds put in a ring?

Here's the deal, my boyfriend gave me a ring a few years ago with 4 diomonds in it. We are looking to get an engagement ring now and want to incorporate the 4 diomonds into the new ring (2 on each side of the big one). So we will need to get a new band and the main diomond and have the 4 other ones put in it. Is this something that jewelers usually do and is manageable? I have just never really delt with jewelers and just need any info you guys can give me! Thank you.