The 29-year-old, who came through the ranks at Spurs as a player, succeeded Jose Mourinho in the hot-seat this week.
And Mason got his stint off to a great start with a 2-1 win over Southampton on Wednesday.
"First of all the feeling is a massive relief," he said. "It's been a whirlwind the last two or three days but thankfully we got the win and most importantly I felt second half we were outstanding.
"The performance, the commitment, the energy was brilliant because I thought in the first half, we found it very difficult.
"It was quite tough to get out and they were very good. They created some chances. Hugo (Lloris) pulled off two world-class saves for us but I thought as the game wore on, we gained control of it and I thought there was only one team that was going to win the match."