and leave them like that, will they eventually lose charge? get weaker? anything?
and if I take a weaker magnet and sandwich it between 2 really strong ones (rare earth type) could it get stronger?
I reallize I am talking about the alignment of the iron atoms or some such but would this work?
I know to some extent it does, I have one rare earth doughnut magnet that will put a permanent charge on a screwdriver by running the metal shaft through the hole a few times.
In any magnet, it will lose field strength over a period of time, but that will depend upon the materials. Some magnets would take literally a few days to reduce strength significantly others will take many lifetimes, centuries and probably very much longer than that.
All materials have some potential to have their domains lined up in such a way as to form a magnet, and their degree of field strength available will vary form virtualy nil to massive.
If you were to take a magnet whose alignment of domains is such that is very much less that its potential, and it has a fairly low coercivity, then there is every chance that placing it within a very much more powerful magnetic field as you propose will increase its field strength.
Your screwdriver is not permanently magnetised as such, but it could remain magnetised for a fair period of time.
You can buy demagentisers for things such as instruments and tape recorders that simply surround the subject with another magnetic field that is changing state, due to AC voltage, all you do is move the defluxer towards the subject and then move it away, sometimes you might have to stroke the item being demagnetised with the end of the defluxer to distrurb that magnetic domains sufficiently.
if I take 2 magnets and force them together with the poles the wrong way
They repel each other and will fly apart.
OTOH IF you constrain them in a rigid frame (strong, non-magnetic material) they will loose some of their magnetic field strenghth.
It might gain a little, but not much.
As above.
Doesn’t have to be a rare earth magnet. Any permanent magnet will magnetize a screwdriver.
It takes an intense magnetic field to magnetize rare earth and other permanent magnets.
Using permantent magnets to magnetize screwdrivers etc. just make them a PITA for most other uses.
You Brits with your quaint terms for things. We call it a degausser–waaaaay cooler. 
Reverse the polarity! :eek: