[CentOS] yum upgrading

I have boxes on CentOS 4.2 that I want to move to CentOS5.

Are there any problems envisaged in trying to move 4.2->4.3, 4.3->4.4 and
4.4->5.0, using yum upgrade and changing the repositories at each stage?

I guess it is not too good an idea to try it in one step.

Or do I need the CDs?

Can anyone advise?

TIA

Best wishes

John

John Logsdon                               "Try to make things as simple
Quantex Research Ltd, Manchester UK         as possible but not simpler"
j.logsdon at quantex-research.com              a.einstein at relativity.org
+44(0)161 445 4951/G:+44(0)7717758675       www.quantex-research.com