I rooted using this
[Root] Universal Xoom Root - ANY XOOM ANY UPDATE - xda-developers method. It's safe and fairly easy but do read through the thread just to make sure you fully understand what you are doing. I haven't heard of xoot but I would urge caution. If this is the one-click rooting method I have heard discussed, it is not reliable and may brick your Xoom.
Rooting and installing 3rd party ROMs is not really all that difficult and has never caused me a problem, but it is possible to completely bugger your Xoom so that it is totally unusable so do be careful and make sure you have read the instructions carefully more than once.
[Edit]
I found something on XDA about xoot (here
Xoot For the Xoom Gives You Root Plus More | xda-developers) and it appears that it is not the one-click method I referred to above, but my note of caution stands. Be careful; you will probably be fine but the worst that can happen is that you end up with a very expensive paper weight so make sure that other people have been brave enough to try this successfully before you do.