I've never hiked the entire length of the SHR, but I've done various sections in search of remote fishing holes. Since I live in SoCal, my hiking style is typically 4 day quick strikes, rather than longer distance thru-hikes.
If you are new to the Sierra, you might consider some of the advice others have provided in terms of cutting down the hike into separate & more manageable portions. That way, you will be afforded various entry & exit points to get a feel for the route.
As many others have pointed out, you should get Roper's book and read AS's trip report @ his web site. You will quickly realize that certain portions of the route are tougher than others eg Snow Tongue & Frozen Lake.
At the risk of revealing too much, if you are a Sierra newbie, you may wish to initially forgo the SHR and focus on the south. Roper ignored the area below Kings because it already IS @ high elevation, relatively isolated (other than the PCT) and has many, many XC opportunities.
For anyone into fishing, the region south of Forester is the holy grail. Nuff' said.