You don’t need any skills for laying aggregate, it’s easy to do yourself. Sometimes it’s best to lay a membrane before the aggregate to stop the majority of weeds coming through. When planting make an x shaped cross through the membrane but keep the incision as small as possible to match the plant size. After planting, lay the flaps of membrane back down around the base of the plant, making the seal as tight as possible. Avoid cutting out any fabric to minimise the chance of weeds coming through. However, to make planting as easy as possible just place potted plants on top of the membrane. You can then rearrange your planting display whenever you like.
For small areas it’s easy to transport the aggregate in bags by hand. For large areas it can be delivered by the ton and moved via a wheelbarrow. For a relatively small amount of work the results can be stunning.