Panny

If this is stating the obvious, then my apologies.
So much will be dictated by how much situational awareness you can reasonably build. The choice of you going into a BVR engagement where you're employing >5nm rely on knowledge of the threat likely before radar detection. The radar can probably detect a fighter sized target up to 25nm, but you're reaching for optimal circumstances. Add ground clutter on both sides, then you having to descend to enter a look-up situation and your detection range will reduce due to the interference(and be harder in general to manage). You have contact(s) on scope, this is further complicated if you have a wingman and you have to issue a sort and hope that the scope can pick out two contacts. Say if you're eagle eyed you get a lock at 15nm, and at worst 10nm(if you didn't spot by then you're not going to really have a 'bvr' opportunity). You're then going to have to check that it is a good lock and you haven't locked something erroneous(so you may have to break lock and start again). Once you're sure you have a good lock, remember to IFF if you didn't during search, if it's an AIM-7E you're carrying you'll have to count to 4 before employing(assuming a vc of 1200 between you and threat, you've closed nearly a mile and a half in that time); 2 seconds for F/M.  For the former missile you'll have to try and get within rmax(and LAR if interlock isn't out) which may not be many miles, which means you're either shooting and blowing through or going to get into a dogfight. F/M may give you a better opportunity thanks to its better range.
The circumstance above assumes that you have a GCI and you know what to look for in the first place. Your RWR could probably help you very vaguely, but not much given it's older gen.
I think, as evidenced by reports like Project Red Baron, so much of whether you win or not is dependent on situational awareness, and employing in a BVR context with the Phantom will probably be dependent on having some support from a controller. Following that you're next thing is probably ensuring that you/WSO is really on it with the radar, knows how to manage it to get a good search probably. 
 
Just basing off the AIM-7E in game(you can mod it onto the F-14), even when you go very high and fast to get an rmax shot I think you'd be exceptionally lucky to get a scenario in which you can skate. I suspect planning for and owning banzai will be the way to go. If the Sparrow gets the kill, then great, otherwise hopefully it gave you better angles against the bad guy
 
I know this isn't tactics per se, but it's worth recognising the number of steps and consideration that have to go into it to get some sort of bvr opportunity

the switch does both - so if you acquire a lock while having gun selected because you wanted a left scan corridor, ayou'll want to rock it back to the Sparrow, or you'll inadvertently fire the gun when you wanted to launch the Sparrow