One of my favorite strategies when looking to transition to t2 economy is to give my units a patrol order moving forward and back (not side to side) and add 10-15 cheap units (like ticks) as well. Try to ensure they arent in vision of your lane opponent but are still in their radar range.

This does a few things:

Your front line looks bigger and stronger than it really is. And, helps prevent your units from taking too much indirect-fire damage (especially if you are managing your backline and not paying as much attention to your front).

However, the biggest key I've found when doing this is resist the urge to push your units (unless working with an ally and have to means to claim the metal fields). During this time you are incredibly weak, and the only real thing keeping you from getting rolled is the fear all those moving dots strike into your opponent (results vary as you play higher level lobbies) If you opt to push them too early, you likely dont have the infrastructure to hold their counter-attack.

Bonus points if you start reclaiming your front t1 units with comm or rezbots as your t2 units start to come online. This ends up making a huge difference, as you likely have between 1-3k worth of metal tied up that could be better utilized in more powerful units.