Hazely Law is a pretty easy hill to bag and no doubt you will visit this one on your way back from Windy Gyle or the border ridge. The Middle is also right at the foot of Hazely Law too if you fancy it.
From the Wedder Leap car park just follow the permissive path north and you're all good.
Follow the route above or find it on OS Maps. 5km to get there with 370m ascent.
You can bag a canny few more hills around this area and here is a walk to Windy Gyle to give you some ideas.