SSD Upgrade and Alignment?

[SolidGrave]

I've read a few people mentioning that they didn't properly align the SSD after a clean install.
I plan to replace my stock HDD and do a clean install on an SSD. I was concerned about alignment though. What is it? Should I be worried or is this only for Hybrid set ups?
Also, what is trim? Is that like partitioning?

EDIT: I think I may have posted this in the wrong section, my apologies.

[Syberia]

If you're doing a clean install of Windows 7, the installer will take care of alignment for you.

[SolidGrave]

If you're doing a clean install of Windows 7, the installer will take care of alignment for you.

How do I check afterwards if everything is good?

[tijo]

Open the command prompt as admin and then type:

diskpart
list disk (find your SSD in there)
select disc # (where # us the number associated with your SSD)
list partition

look at the number after offset, if you can divide it by 4kB, then it is aligned.

[ellalan]

How do I check afterwards if everything is good?

Go to System Information( Control Panel-> Administrative Tools-> System Info), click Disks ( Components-> Storage-> Disks)
Divide the value of "Partition Starting Offset" by 4096, if you get a whole number then your SSD is aligned.

EDIT: I saw tijo's post after replying.