David Healy made sure that Nigel Worthington got off to a winning start as Northern Ireland manager.
The Fulham striker continued his remarkable scoring sequence to keep the province on course for the finals of the European Championship for the first time.
Healy grabbed a brace to take his tally to 11 goals in the campaign and 31 overall in 57 international appearances.
With Kyle Lafferty also scoring his first competitive goal, Northern Ireland were able to overtake Spain and move into second place in qualifying Group F behind Sweden.
Worthington was looking to build on the strong foundations laid by former boss Lawrie Sanchez and he certainly got his wish.
It took Healy just five minutes to make the breakthrough after coming close in the first 60 seconds following a surging run by Chris Brunt. He showed what a natural finisher he is after Burnley striker Lafferty started the move. Lafferty showed good skill on the byline and pulled the ball back to Keith Gillespie. He whipped in a cross and Healy escaped his marker to head in his tenth goal of the qualifying campaign.
Northern Ireland, however, had a scare in the 18th minute when Mario Frick got on the end of a cross from Michele Polverino. He powered in a free header which Birmingham goalkeeper Maik Taylor saved at the second attempt.
Then Healy squared the ball to George McCartney 30 yards out but his ambitious attempt on goal cleared the bar.
Lafferty squandered a glorious chance of extending Northern Ireland's lead in the 30th minute. Unmarked at the back post he somehow managed to direct a header wide of the target.
Healy, however, took advantage of a mistake by Michael Stocklasa to add a second goal in the 34th minute. Stocklasa inexplicably played a free-kick across the face of goal and into the path of Northern Ireland's prolific striker. Healy wasted no time in accepting the gift, rattling a superb 20-yard shot beyond goalkeeper Peter Jehle.
Considering he also scored two goals in three games for Fulham, Healy is a man right in form.
Northern Ireland made it 3-0 in the 56th minute after a flowing move that delighted the crowd. Chris Brunt released West Ham defender McCartney - in his first appearance for the province for 26 months- and he went on the overlap down the left. The former Sunderland left-back delivered a deep cross into the box and Lafferty's finish was emphatic. It was a goal he could be justifiably proud of.
Worthington decided to shake things up in the 62nd minute with Stuart Elliott replacing Brunt, who had put in a hard shift.
Elliott found the net in the 67th minute but the Hull forward's effort was disallowed for an infringement.
Steven Davis had a chance of extending Northern Ireland's lead in the 81st minute when he found space 20 yards. However he hurried his effort and failed to test the goalkeeper the ball flying over the bar.
Liechtenstein were rewarded for their hard work a minute from time when Frick pulled a goal back after some sloppy defensive play.
Northern Ireland are daring to dream, however, and now have a healthy tally of 16 points from seven games.
Next up are back-to-back qualifiers against Latvia and Iceland next month - both are struggling to get results.
