ᐅ How to Carry Out a Low-Budget Land Survey?

Can I operate this as a "standard" user?

Hmm, no idea.. in this case, only "trial and error" helps… if you meant the app.. the same applies to the leveling device.

Alternatively, you can try the analogue method and use a water level hose. The hose obviously needs to be long enough. Then, by observing the water level in the hose, you can determine the height difference relative to the ground level. This method only works for gentle slopes or if you have a ladder.

A truly low-budget method would be: one person stands "above" with a spirit level and laser, while the other is "below" with a tape measure. --> Laser hits the tape measure. This way, you know the height difference and can calculate the rest.
If the slope is longer than the tape measure length, you can repeat this in sections until you reach the bottom.
This should be sufficient for a rough estimate.

That’s a cool idea. I’ll put the laser on a one-meter (3.3 feet) tall tripod so I can measure it precisely. Amazing. I’ll report back on how it went! I can get the GPS coordinates from my phone, so I’ll have a rough idea of my location. Great!

Have you already tried the Geoportal Bayernatlas?