[ciburri]

#1 DO NOT PANIC, IT IS NOT THE END OF THE WORLD! YOU CAN DO IT!
I know it is tight in there, but.....
The transmission end of the axle is now sitting inside the axle boot, so with one hand slightly lift up the shaft while with the other push in and rotate hub up to 120 degrees. Why 120? Because it is a three prong joint inside. Do not use hammers or hard force to push it in because you can damage 3 bearings that are at the end of each prong of the joint.
Do this with car in 1st gear or reverse on manual, or park if it is auto.
Be patient! If you have a friend supporting the shaft you can use both hands to slowly turn the hub and apply pressure to pop it back in.
Patience is the key!
Once it pops back in, you will notice that popping out of the shaft moved the small end of the booth (closest to transmission) out of it's grove on the shaft. You need to pull it back in the grove. If you do not, joint might cut the boot from the inside and eventually split the booth!'
Lubricate the shaft from the booth to the grove with grease, WD-40 or even engine oil! With thick gloves on (not rubber gloves, but construction or "Mechanix" bury your fingers just behind the clamp and pull toward the groove (toward yourself). It is hard, but it can be done. Reason I am advising heavy gloves is so you do not make a cut on the booth with your nails! Even a smallest scar can cause premature tear of the booth. I know you will be tempted, but do not use use any kind of pliers and a rag to do it! Pliers are sharp and will find a way to damage the booth! Murphy's law!

I popped it out myself when I was changing my springs! Fortunately years of working as mechanic as a teenager and replacing ton of axle booths paid off! Beside my Fit I also changed springs on Tool's Fit. On his with use of straps axle never popped out!

Tip for the prevention: instead of jack stands or jacks supporting the hub, use rubber cargo straps with metal hooks at each end! Run it in between studs on the hub and sub frame. The amount of stretch strap gives you is enough to swing the damper out without popping axle out! On left side turn the steering wheel all the way to the left, on the right side all the way to the right. It will give you more clearance to slide damper out of the hub support sideways without having to move hub too far out and pop the axle out!
Also, cover the rubber booth just below the damper with a thick rag or plastic! Some of you might get caught by the weight of the damper and spring assembly due to arm fatigue from getting to that point. Damper can easily slide down and cut the booth before you can even blink! It happens even to most experienced mechanics. It takes just a small attention span lapse to occur! That good deal on spring price can get very expensive if you tear the booth and have to replace it!
Good luck! Be patient and you can do it no problem!

Ivan