Yep. That's all there is. I don't know if you have done it with your instructor, but it's exactly the same. Just tell ATC what you want.
Two sample examples:
Approach, N1234X would like the VFR practice ILS 35 into KABC with vectors to final.
Approach, N1234X would like VFR the practice RNAV 17 into KABC from [FIXNAM]. [If applicable] With the course reversal at [FXNAM].
I've never actually said "VFR." They know you are VFR but if you are playing on your own as an instrument student, it's not bad idea to mention it. Kind of on the same level a "student pilot." Unnecessary but can be helpful.
Then it's just a matter of following instructions. At some point, your instructors for the approach will take one of two forms:
1. ".... Cleared for the approach. "That doesn't mean you are under IFR. It just means that ATC is providing separation services.
2. ".... Practice approach approved. "No separation services provided.
The difference between the two tends to be destination, facility and sometimes controller preference.
It's not even preparation for brain surgery
. But it is really so much easier if you do it with your instructor first, tell them you want to practice with a safety pilot, and pay attention to what they do and say.