Installing FBSD 5.3 and 5.4

[Brian Astill]

I guess there is some small incompatibility between my system and FBSD. 
Whatever .. the effect was that as I kept CVSupdating from FBSD 4.7 
through 4.10 I gradually lost usability as first one program then 
another, failed.
I decided to wait for 5.3 before using FBSD again. 

In the meantime I have been running Knoppix 3.4 with complete 
success,though it will have its own HUGE upgrade problems in due 
course.  
I MUCH prefer FBSD and its way of doing things, anyway.

So ... I've waited for FBSD 5.3, have purchased the Release 4-disk set 
and have 50G diskspace available.

Maybe it would be better to split that 50G in half, install 5.3 in the 
first 25G, leaving the second free for 5.4 release.  Later I would 
install 5.5 release in that first partition, then 5.6 release in the 
second, and so on.  

Question 1.  Is this plan sensible and/or practical?
Question 2. If the answer to (1.) is "No", what alternative would you 
suggest?

Thanks for your (anticipated) helpful advice.

-- 
Regards,
Brian
sos-sa.org.au