I use the FMC, line select the waypoint, then hit HOLD button, then from the waypoint in the scratch pad place it in the open hold box, hit EXECUTE and boom, it will work out the entry for you and fly it and the hold!
if on the off chance your not flying a Boeing 738 then I think just look at the plate and where your coming from,, what is the most simple way to get inbound to the fix been able to stay in the potected area,,, forget all the complicated numbers and angles,,, in the real world you just make it work, flying and ground school if two different things.