You can do your own port work. Simple rules - take off sharp edges in the ports and remove undulations in the port walls. Don't open up the diameter of the ports, just tidy them up. If you are going to open the ports, only open the inlets so you can match them to the manifold. DON'T open the exhaust ports - you can clean them up and polish hell out of them if you want but increasing exhaust port diameters can severely affect exhaust pulses and gas scavenging. If you have a dremel/mini die grinder and flex drive shaft this is adequate for minor port work. If you have a power drill with a flex drive this will make life easy for smoothing out port walls with a small flap sanding drum (something that will just fit into the ports - use a silicon spray or water as a lubricant to stop the flap sanding drum from grabbing and bouncing around). The only risk of your tackling the ports is that your head has already gone through a shop and you could accidentally damage a valve seat or the machined face of the head. As for the end result, it will depend on how much you want to put into it. I spent about 40 hours on the head I'll be swapping later (another 5 more if you add the manifold mods I performed - I went over it a second time as there were a few areas I wasn't 100% happy with)