Newbie curious when to begin clamping

What other exercises are good for girth?

I recommend that you keep following the Newbie Routine until it stops working for you (and after conditioning, whichever comes last :D ). After that, if you want to increase the intensity a bit, you can Jelq with a higher erection level. Leaving room for expansion though.

Exercises that target girth (for future reference) include:

Uli’s and Squeezes
Jelq Squeeze
Uli #3
Extreme Uli
Plumped Bend
Sadsak Slinky
Horse 440 Squeezes

Is there any way to differentiate what erection level I’m at? Your opinion on what a 40% erection is could be different to mine.

0% is totally flaccid.
100% is rock hard.

It’s hard to find and maintain the adequate % to jelq, we all go by feel. Just avoid jelqing erect and you should be fine.

Say I’m performing a Jelq with a semi-erection but I keep going into a full erection, is it okay to stop and wait for it to go down before resuming?

Thanks again, man.

That’s normal, happens for most of us newbies. If get too erect, stop and wait until subsides.

In few months you will be able to control yourself during exercises.

By the way, make sure you did not stroke the jelqs too fast. Fast jelqs estimulates too much your penis.
3 to 4 seconds per jelq should do the job.