I have been successfully autoguiding my SA with KStars and PHD2.
Strictly speaking you only need PHD2, but it is better to have KStars and EKOS control the camera so it can at least dither in RA. If you are not interested in dithering, you can simplify to just PHD2 and intervalometer.
Aurneth gave excellent instructions, including disabling Dec for EKOS internal guider. But if you use PHD2 there are 2 places you can do that. First, under the guiding graph, on the far right adjacent to Mx DEC, Change Auto to OFF. The other way is in the Brain>Algorithms> Dec guide mode: OFF.

KStars and EKOS can really help with aligning your target with plate solving.
For locating a target I will set the solver to only Sync. Before running the solver manually set a sync point near where you think the camera is pointed. Use manual sync points whenever you make large movements.

The successful result of the solver if you use your main imaging camera will be shown on the skymap. Use that as a guide for RA, Dec and rotation adjustments.
If it has difficulty solving, try increasing exposure time. Or clear the mount alignment to eliminate your manual sync points.

You can also polar align with your guide scope and the EKOS Polar Align Assistant. Choose manual slew at the beginning, and rotate ~30° for each step.

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