Tactics are instructions that you, as a manager, would give to them as a team. You've seen videos of managers standing in the dressing room, waving their arms around and calling everyone 'Smudger' while the players are still putting their socks on and breaking the kit lady's heart by rubbing Vaporub over otherwise perfectly clean shirts! Player Instructions & PPMs are those one-to-one chats that, typically, the Assistant Manager gives while fumbling with a stack of laminated flipcharts that actually require four arms to operate properly. The player nods (whilst chewing gum, usually) like he's taking in every word (but he isn't really listening).
Or, to put it another way, Tactics tell a player where to go; Player Instructions & PPMs tell him how to get there... and what to do when he gets there.
You have to decide how you want your team to play and decide for yourself whether any instruction - at the team or individual level - is contradicting your managerial vision. Or you can do a Plug-&-Play download (...so I gather).
Think, also, about how your players relate to each other. If a full back is overlapping, who is he overlapping and what does that player do while being overlapped? Is someone else covering for the full back in the defensive area? Who can benefit by playing one-twos to get further forward - and who should he play those one-twos with? If I'm a full back crossing from deep, where am I aiming the cross and who should I expect to get on the end of it? Does he favour crosses on the ground or at head height? If I want to counter attack quickly, what's the fastest way to get my team from my penalty area to the opposition's... who is best at distributing the ball from the crowded defensive area to a space where my fastest attackers can attack the final third? Where are those fastest attackers and where are they running to? What options do they have in possession, if their forward progress is halted? How does the team deal with having the attack halted? Can they switch direction and find another way? Are they comfortable in possession, in the opposition's half, and patient enough to work an alternative route to a shooting opportunity? If we have the ball on the right wing but there are defenders in the way, where is the space? Who is lurking to exploit it and how do we get the ball to them, quickly? Are we leaving ourselves exposed at the back or do we have enough Steady Eddie's - like a DM - keeping everybody honest? Notice how full backs on Support duty don't take part in counter attacks - they move up to offer width only when that initial attack has been stopped and your team has the ball in the opposition's half. Look for the triangles of those players who can move the ball into dangerous areas for you.
Sorry - brevity is not my strong point. Lots to ponder, though.