に先立って => before; prior to ~ N2
に[先立「さきだ」]って/に[先立「さきだ」]ち/に[先立「さきだ」]つ => Before A occurs/takes place N2
Time, Situation
ている => Repeat N5
Continuous
ている => Already done N5
Status
てみる => try doing ~ N4
Evaluate
ている => Already...(completed) N5
Completed
ている => Used to... N5
Experience
てみる => Try somethjng N4
ている => Being... (past) N4
てくる => to start ~ N4
Situation
ている => Doing something... N5
Status
~ さて...てみると => Until ... then, ... then... N1
Time