The leap of faith you take in buying a festival ticket once you've seen the lineup announcements, praying that all of your favourite artists won't be sandwiched in the same time slot across umpteen different stages.
We've all been in those shoes.
Luckily the Reading and Leeds Festival 2018 timetables have been announced a couple of weeks prior to the Bank Holiday festival, so you won't have to suffer that unpleasant fate once you're in amidst the action.
We've pinpointed the major clashes that might help to alleviate the unenviable decision you'll have to make whilst half-cut, so at least you can start planning your beer-drenched itineraries in advance.
Wolf Alice vs. The Horrors
If you've decided against the pep and whizz of pop-punk stalwarts Fall Out Boy who headline the main stage that evening, then you'll have to choose whether or not see Ellie Rowsell's grunge-revivalists or Faris Badwan's band of gothic-infused psychedelia.
A milestone in each band's careers, so either way, expect engrossing performances worthy of their respective stage-topping slots.
When & where: Friday at Reading, Saturday at Leeds: Wolf Alice (22:30, BBC Radio 1 Stage), The Horrors (22:45, Festival Republic Stage)
Bicep [live] vs. Death From Above 1979
After widespread acknowledgement that deep-house duo Bicep deserved a Mercury Prize nomination for their self-titled debut, they now have to contend with filling the same time-slot as racket-mongering Canadian duo Death From Above 1979.
Difficult choice? Yes. At least you can take solace in the fact that you'll be dripping with sweat at the end of either performance.
When & where: Friday at Reading, Saturday at Leeds: Bicep (21:00, BBC Radio 1 Dance Stage), Death From Above 1979 (21:45, Festival Republic Stage)
Mike Shinoda vs. Brockhampton
It'll be the first return to Reading/Leeds with what is bound to be an emotional performance from Mike Shinoda since the loss of Linkin Park frontman Chester Bennington last year.
Your decision will depend on whether the loyal LP fan in you will urge you to the Main Stage, or whether you'll want to let-loose to Brockhampton's infectious pop-rap party vibe.
When & where: Saturday at Reading, Sunday at Leeds: Mike Shinoda (14:50, Main Stage), Brockhampton (15:40, BBC Radio 1 Stage)
Dua Lipa vs. Sigrid
When two titans of girl-power-pop collide, you'll no doubt feel the shockwaves. Both artists are on a path to world domination, so now's the time to pick your side.
When & where: Saturday at Reading, Sunday at Leeds: Dua Lipa (17:15, Main Stage), Sigrid (16:35, BBC Radio 1 Stage)
Kendrick Lamar vs. Kate Nash
This may be an easy decision based on your taste, but each performance is bound to be a spectacle in its own right. A glimpse into the progressive future of hip-hop, or the nostalgic pop of yesteryear?
Over to you.
When & where: Saturday at Reading, Sunday at Leeds: Kendrick Lamar (22:00, Main Stage), Kate Nash (22:45, Festival Republic Stage)
Hinds vs. Lady Leshurr
Two outstanding up-and-coming musical talents on quite different ends of the musical spectrum.
Whether it be the freewheeling garage-rock quartet or the freestyling lady-in-waiting of grime that bends your ears, we're certain you'll be seeing them both on the Main Stage in the years ahead.
When & where: Sunday at Reading, Friday at Leeds: Hinds (20:45, Festival Republic Stage), Lady Leshurr (21:10, BBC Radio 1 Xtra Stage)
Kings Of Leon vs. Slaves
One setlist will be brimming with bangers. The other will leave your head banging once the setlist ends.
One will remain a headliner for years to come. The other a headliner waiting in the wings.
When & where: Sunday at Reading, Friday at Leeds: Kings Of Leon (21:30, Main Stage), Slaves (21:10, BBC Radio 1 Stage)
More like this: