Ideally, you want to create one form that assists both user types. Multiple solutions could create cognitive load for users that aren't sure which path they should take. Ultimately, you should have the following goals for your solution:
- A form that you can get through quickly for experienced users
- A form that can provide support to users that aren't familiar with the process
This could be done with a switch as you have suggested. Or you could keep the guidance on per question basis so it's not "all or nothing".
I actually also work on a job board. We've faced a similar issue. We solved for this in the following manner:
We provide a field title alongside guided copy that we believe can help all recruiters, new or seasoned, alongside a "tip" section. Upon selecting this section, the user is shown more in-depth advice on how to write (in this instance, a job title).
We break the guidance up so we don't overwhelm the user with large pieces of copy. This lets the user choose how much they want to consume. Each user will have varying amount of time that they can dedicate to this task. With each "slide" the guidance gets more detailed.
You could reveal the first tip by default the first time the user enters the page. Another idea is to create an animation that draws attention to the feature if you notice that the user it taking their time at a certain section.