Here are the best instructions I have seen regarding how to build the slopes and speed bumps to hold the soil.

Covering & Protecting a Pond Liner

They don't specifically address it in the video, but it does appear in the background that they are covering the liner by hand after the cover soil is stockpiled right at the edge of the pond.

I have also seen a video of covering using heavy equipment (but I couldn't find it). In my recollection, they just built out a soil cover on top of the liner from their stockpile. The equipment only traversed the liner where it had 4-6" of soil in place and then they built out ahead of their safe travel zones.

If you decide to go with the liner, I would determine which manufacturer you are going to purchase from. Then call them and ask them to explain the proper installation procedures for your conditions.

Good luck on your project!