Dif drop is easiest and safest, but as said, getting the springs put that last bit can be awkward. I think it depends on what springs are fitted to what model car and it's ride hight/spring length. Mv6 springs are physically shorter than stock, and I and some other members have ident LA springs which on my car sit higher still. I fully expect a battle removing those, usually a pry bar will lever them out.
Also unhooking the exhaust at the rear can allow a further drop if the drive shaft hits it on the way down. But be sure the exhaust isn't rusted to the point it will snap or get damaged with all that unsupported leverage on the joints.
On fe fitting standing on the hub can help. Also somebody suggested using the car jack in the in car tool kit to lever the arm down as an alternative to the diff drop method in the guide. I would not recommend that as an alternative, but it may help get that last bit of clearance at a guess...? Not tried it my self. Just be careful nothing is over stressed or the jack flies out. :-/