What do you mean by not being successful? What happens?
I've not had any issues yet with static FBX models (animated can be a bit finicky), you just choose the FBX, then when the importer loads up click the texture box, navigate to you colour texture and select it, then your model will show in the display and you can save it.
i7 7700,k NV1070 8GB, 16GB 3200mhz memory, 1x 2TB Hybrid, Win10.
i5 4760k, NV960 2GB, 16GB 2333mhz memory, 1x 2TB Hybrid, Win10.
i5, NV1050 4GB, 8GB memory, 1x 1TB HDD, Win10.
i3, Intel 4000 series graphics, 6GB memory, 1x 500gb HDD, Win8.1.