Keith Lasley's goal eight minutes from time earned Well their first victory at Fir Park since the beginning of September.
"I thought in the first-half we played some very good stuff and didn't take the chances we created," said McCall. "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."
He added: "It was a big three points for us, especially with the big cup replay against Aberdeen on Tuesday."
McCall was 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.
"We gave Lee a new contract in the summer and that was on the basis of his performances in training and in reserve matches. 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."
Ross County boss Derek Adams felt poor defending cost his side at Fir Park.
County travel to Inverness for a Scottish Cup replay on Tuesday evening and Adams is adamant his side must perform better to stand a chance of progressing to the last 16.
"We didn't do well enough in the game to merit taking anything from the game," said Adams. "If we defend as kamikaze as we did today then we won't get a result against a team like Motherwell."