I have been doing
exclusively jelqing since the beginning of October (I had to stop for about a month and a half before that, which sucked) and have gained 1,5 cm / 0.6" in my BPenis EnlargementL and 0,5 cm / 0.2" in EG.
My routine consists of a daily session of 650 jelqs to start the day, right before my daily shower.
Personally, considering I'm only doing one really tiny bit of DLD's [words=http://www.mattersofsize.com/forum/penis-enlargement-newbie-forum/1597-dlds-first-routine-i-gained-2-inches-with-this-routine-full-tutorial.html]newbie routine[/words], I am very happy with the results and it has been keeping me motivated. On the other hand, I am not in a hurry, so I prefer to take my time and have the results showing slowly but steadily.
If you don't want to wait as long as I do, then by all means, go for the [words=http://www.mattersofsize.com/forum/penis-enlargement-newbie-forum/1597-dlds-first-routine-i-gained-2-inches-with-this-routine-full-tutorial.html]newbie routine[/words] and you should be fine.
The bottom line is that, YES, you can see results using just one of the exercises, either jelqing or stretching.