No, not really, it's thinner than engine oil, similar to an 10W40.
Through a small funnel into a small bore tube into a differential dipstick tube, it IS like pouring honey, trust me I do this at least 8 times per year on V6 Alfa's I look after
All with the correct levels and NO spillages performed with the same process advised above
You can simply ignore the many years of experience, use the long spout provided on the bottle cold.... End up stretching over the engine block straining your back while waiting 15 minutes for it to eventually pour out of the bottle and end up with more running over the dipstick spout than you actually put into the gearbox... That's if you can manage to reach it in the first place comfortably
Then if you only bought 2 litres to originally do the job you may find you have to abort the topping up process in order to drive frantically with low gearbox fluid back to Halford's before it closes on a Sunday afternoon in order to buy yet another overpriced 1 ltr bottle at least to take into account you spilled god knows how much over the back of the diff instead... That's assuming you get there without succumbing to the fumes of the gearbox oil that you managed to spill on the down pipe as it burns off in a trail of smoke...
Then you really don't know how much is exactly in the box anyway after the failed attempt of refilling... Sound Familiar?
There is always a reason why I give certain tips out and full procedures...
The "teach the Granny to suck eggs class" is down the hall on the left