Keith Lasley's goal eight minutes from time earned Well their first victory at Fir Park since the beginning of September, leaving McCall delighted to end that run.
"I thought in the first half we played some very good stuff and didn't take the chances we created," he said.
"The second goal was a great lift, but then for some reason we stopped playing - I'm not sure if was anxiety as we hadn't won at home for a while. But it was a big three points for us, especially with the big cup replay against Aberdeen on Tuesday."
Rocco Quinn unleashed a sensational 30-yard strike to give the visitors the lead after 17 minutes, however, their opener was soon cancelled out as Michael Higdon headed home Chris Humphrey's pin-point delivery eight minutes later.
Nicky Law capitalised on some slack possession to fire the hosts ahead in the opening minute of the second half, but County responded positively and Quinn hammered home at the second time of asking to level.
Both sides showed a determination to grab a winner and Lasley clinched the game for Motherwell when he flashed an effort beyond Mark Brown with eight minutes remaining.
As well as the goalscorers, McCall was also full of praise for deputy goalkeeper Lee Hollis, who produced a wonderful last-gasp save to ensure three points for Motherwell. However, despite his heroics, McCall admits Darren Randolph is likely to replace Hollis for Tuesday's William Hill Scottish Cup replay with Aberdeen.
"It would have been cruel as we have lost late goals already this season," McCall added. "I have said to the lads that if they come in for four or five games and play well they will stay in the team, however, if you come in for one or two games then and replace someone who is playing well then it's likely I will take you back out.
"I would have thought Randolph will be back in goal on Tuesday, but Lee has shown he is a ready made replacement should Darren move elsewhere at any stage."