Tommy will swap the 15-a-side game for the abbreviated version in two months after being named in a Scotland's 12-man squad for Glasgow 2014.
Ahead of Ibrox group-stage clashes with New Zealand, Canada and Barbados on July 26, the 25-year-old admits his sevens CV is short on detail.
Tommy insists his performances for both Scotland and Glasgow, coupled with some handy hints from his team-mates and coach Stevie Gemmell, will help him take to the shorter game with ease.
Tommy told the Courier: "My sevens history is non-existent really. Apart from a minor tournament here or there, there is nothing major.
"So it's a new challenge and I will give it a good bash. I'm excited about it - it couldn't be playing on a better stage than Ibrox.
"I've been getting a lot of information from the other guys at Glasgow and Scotland who have had a go at sevens this year. They have all enjoyed it and I'm sure I will too.
"I've had a good year with Scotland and the Warriors and I'll be speaking to a lot of the guys over the next few weeks so I'm sure I will handle the transition."
Tommy earned his first Scotland XVs cap against South Africa last summer and featured in three Six Nations clashes this year.
But before he can start focusing on the Games, he still has the small matter of Glasgow's RaboDirect PRO12 final against Leinster in Dublin a week on Saturday before he jets out for new Scotland coach Vern Cotter's first two games in charge against the US and Canada next month.
"I could not have asked for a better 12 months," he said. "I got my first cap last summer, played a lot of games for Scotland and club wise, things have been amazing.
"Glasgow is where I spent the majority of my time and the fact the boys around me are enjoying their rugby so much is great for me too.
"It's been exciting but there is still a lot to do before the Games. We have the Rabo final next week and the Scotland tour to come first, so I won't have too much time to sit and get nervous about running out at Ibrox."