vSphere ESXi 5.5 environment - updates and maintenance mode question

I am looking into updating esxi hosts in an environment that's gone unmanaged and non been updated in a while.
I believe there are many updates needed for the hosts, as shown here in this screenshot: https://i.sli.mg/HCi6w7.png 

My understanding is that for updates, it's best to put the host into maintenance mode, so that the VM's go to other hosts.
What's the best way to ensure that is configured properly, and that there would be enough CPU/RAM on destination hosts the VM's migrate to to function while the host is in maintenance mode?

I'm assuming given the volume of updates available, that they all need to be installed, and will require multiple reboots...
garryshapeAsked:
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Andrew Hancock (VMware vExpert / EE MVE^2)VMware and Virtualization ConsultantCommented:
You just need to install the LAST and LATETEST update, ALL updates are cumulative!

Make sure your other host, is the same as the current host, same CPU and Memory in the Host.
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garryshapeAuthor Commented:
Oh ok that is good to know about the updates.
But for the other hosts I will need to make sure they have enough free ram and CPU to take in the VMs that will migrate ?
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Andrew Hancock (VMware vExpert / EE MVE^2)VMware and Virtualization ConsultantCommented:
But for the other hosts I will need to make sure they have enough free ram and CPU to take in the VMs that will migrate ?

Yes, if they need to be powered UP, Memory is often the bottleneck.
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garryshapeAuthor Commented:
awesome ty
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