We can model the hands a part from the body because the model uses a hood. You have the choice to work any part you’d like to. So then after all we're going to "join" every parts.
At the beginning I explained the first parts of this tutorial very detailed that’s why I'm going to "skip" some parts. I suppose you have full conditions to understand the steps of the tutorial without showing all the evolution.
1. Create a plane object with dimensions: L900xW600 and work like part 2 of the tutorial. Convert this object in Editable Poly and adjust the vertexes as image 151 (you can create the hand without reference image but myself prefers to use one).
2. Accomplish a sequence: selections, chamfers, extrudes and adjusts in the vertexes.
3. Add more details.
4. Continue the sequence cuts and the fine adjustments on the index finger. Again you can use many references to make the work easier.
5. Obtain this result.
6 .Continues with the process: Chamfer (Shift + r) and move the new vertexes.
7. Go to mode sub-object Polygon, select the index finger and with “Shift” drag it to the left in front of the viewport. Clone it as an independent object.