The correct setup is important to get best performance from the boat. For day sailing that’s not so critical.
A reasonable amount of rig tension is necessary and a highfield lever will achieve that. If it is moderately difficult to apply the tension then that’s ok.
Usually the forestay has a short rope tail, if yours is like this then the method we use is fine; one person puts the mast up and applies some pre-bend (give the mast a shove at the gooseneck) and holds the mast in that position, the other person then gets the forestay secured as tight as they can.
If the halyard ever fails, or you change headsails then you still have reasonable rig tension.
hope that helps