Prefab lightmapping/Prefab lighting

Hi everyone. I was thinking about lightmapping and I got a idea but how I don't know how I can do it. here is the thing. Lightmapping the all scene with objects is very long process what if we do it one by one with prefab editor (I don't use too much prefab editor) I know it will be take same or more time as all scene lightmapping process but at least I can see the errors on my models very quick (light bleed or bad uv mapping) I can do it on maya or similar softwares but that's more complicated and takes more time for newbies like me so is there a trick or guide to share I'll thankful.