There are many ways Ive done it.

You can easily put 3 feet of rubber line on the front steel line and turn your compressor down to 5 psi and with your normal air blower and a red shop rag you can have it drained by pressure in a matter of minutes.

However one thing your going to miss by just draining it is the jelled up bad stuff in the tank if its really old, that sticks to the inside and then your buying the clear plastic filters by the 3 pack.

If its that bad, but you didnt mention how old it was.

Ive had 3-4 year old gas that reaked but I just diluted with new gas and ran out the old but kept a good clear filter on it.

Going back to if it has gotten really bad, drain it and drop it or drop it as it is, its not hard, two straps, a 2x12 on a floor jack or simply rest it on your knees.

Anyway you do it, its a nasty few hours work but when done your good to go.

But again, if its 3-4 years old, id consider dilute it and run it out, ive never had an issue with a pre filter.