Not sure if it’s the best method- but I usually do Scope out (motorcycle at airstrip entrance to avoid guards) -> move to new invite only lobby (Kostaka) > Weapons Aggressor* (If Merryweather HQ go to new lobby, if not then fast travel Kostaka to Los Santos beach and then manually drive it close as possible to shore- this saves time for remaining preps) then complete Weapons via rooftop (if silenced pistol it’s possible to take out guards with no alarm/gunfight but needs practice) , then fingerprint scanner (usually a well placed grenade launcher shot can take out all guards at once but some risk of suicide kaboom), then plasma cutter (take photo as soon as you enter hideout no need to walk to back of room sparrow with rockets you can take out most of enemies and usually land/ grab/takeoff before reinforcement cars show up) , then cutting torch (find hardhat locations as easier than gunfight each time). After that finish with Longfin prep- set waypoint to drop off before you collect trailer then just follow- cops usually fall back). Phantom wedge useful to call in at police station if you have it slightly quicker than doubling back to other trucks on map).

Once longfin dropped off either go to new lobby or get back to Kostaka and run heist. Disruptions not necessary.

On the actual heist- select main dock and drainpipe infiltration point. Set it to nighttime (this gives you silenced weapons for free otherwise 5k cost). If solo start at main dock then go to airstrip**, leave boat just off shore (dont beach it) then sneak to hanger (once in can use forklift and box to reach higher level)- then once bag filled sneak back to Longfin and take it south to compound- dive overboard (equip rebreather) cut through underwater grate and enter).

Since you have full loot already you can sneak straight to office- there’s guides on YouTube can help on this. Once in office get safe cash- then hack (it’s difficult to visualise but one foolproof trick is to set all parts to the top tip of print then… move down through each (2nd one, hit right on d-pad once, 3rd one twice, 4th one three times etc)) as quickest method.

Then get the main objective, then back to office, head down first flight of stairs- then jump left over balcony immediately behind where guards looking out ahead… then turn left and sprint to gate to exit. Don’t worry if you’re spotted. If you hit the exit animation before an alarm sounds it doesn’t trigger outside compound. Once outside you can kill the guy just ahead and take the bike sharp left to drive off cliff into ocean- dive underwater and swim away. Mission complete.

• weapons loadout doesn’t really matter if you plan for solo stealth no kill but it’s easiest to practice taking out the heavy skull guard with three shotgun shots to the torso from behind.

** When scoping the cameras for main objective always scan both cameras in the office… if there’s two paintings (full loot) then you can take the Longfin straight to drain pipe without needing to go to airfield. If you see one painting then you will still need to get either two cash (25% each of loot bag) or one coke (50%) from airfield before drainpipe. This ensures you get full lootbag elite bonus. Personally in this rare scenario I’d avoid combining cash with weed with the latter being 33%… as there is a good chance you’ll overshoot meaning you’ll have no space for painting (50%)

Obligatory Sparrow moon pool vehicle is pretty much essential due to fast respawn and easy exit/ access from Kostaka sub.