I agree with Mark147. Before you try to fly solo in IMC, make sure you feel you've had good dual practice in real cloud without foggles rather than under the hood. There's a big difference.
Then, I'd recommend flying solo in very poor visibility but where you can see the ground. Then, in better conditions but with a reasonable layer of stratus, base 2500, tops 4000, plog a route that allows for straight line climbs & descents where you are unlikely to get ATC re-route requests. You could also use an aircraft with has a basic autopilot, heading bug, wing leveller as a backup. But know how to use it first.
You've got all the time in the world to build confidence, and only a second to screw it up. Eliminate risks by being careful and methodical.