Then I followed the advice to use a putty knife as a backer, then a small flat blade screwdriver to get under the lip...left it there to hold the gap, then moved about 3 inches away and did the same.
You can literally hear the silicone tearing as you go.
Then I went straight for my small flat pry bar, used the putty knife to protect the edge and twisted it until the seam opened to the top.
Then I used my hands only.
5 minutes, tops.
