Just finished doing all of mine on Wednesday, I put longer ones in. With the original ones in place the nut was only holding on about 5mm. With the new ones it's almost a full 25mm.
You have to remove the calipers and brake discs, don't be surprised to find the caliper bolts extremely tight.The front ones on my UK brakes were almost impossibly tight!
You can knock them out with a hammer but I wouldn't recommend it as it won't do your wheel bearings any good.
I used a slightly modified ball joint separator to squeeze them out, here's a pic.
The fork bit has to be opened up a liitle to fit over the stud.The studs are slightly too long to be a good fit in this tool so I cut about 8mm off them with my angle grinder and they then squeezed out very nicely.
To pull them in I put them through the hub and then placed a snuggly fitting steel collar over them(about 30mm dia and 20mm deep), this will help you align them squarely before you pull them in with an old nut(good thread though).
Not sure which studs you're using but the ones I bought from Trackstore were extremely tight, I actually sheared one off when pulling it in.
I had the spline on the stud machined down from 14.35mm to 14.05mm and they were a lovely fit.
When I pulled them I used my torque wrench , I wanted to make sure I didn't over stress them which would lead to premature failure.
I set the torque wrench to 80 llbsft and pulled them, the wrench clicked and they were fully seated.
Like I said I don't know what studs you're using so it's best to be aware that they could be too tight!
Anything else, just ask!