Late 2008 aluminium Macbook with ML...? PLEASE HELP!

Hello,

I'm currently running SL on a Late 2008 Aluminium Macbook and thinking of upgrading to Mountain Lion. I know this can be done. But I'm not sure if Mountain Lion would run smoothly given the age of my Mac. It is very important that my system is smooth and stable as I use my Mac for work!

Here's are my details;

Model Name: MacBook

Model Identifier: MacBook5,1

Processor Name: Intel Core 2 Duo

Processor Speed: 2 GHz

Number Of Processors: 1

Total Number Of Cores: 2

L2 Cache: 3 MB

Memory: 4 GB

Bus Speed: 1.07 GHz

Boot ROM Version: MB51.007D.B03

SMC Version (system): 1.40f2

Serial Number (system): W89121X98QR

Hardware UUID: A94E097D-DC57-516C-B711-58FD9D912AB9

Sudden Motion Sensor:

State: Enabled

And graphics.....

NVIDIA GeForce 9400M:

Chipset Model: NVIDIA GeForce 9400M

Type: GPU

Bus: PCI

VRAM (Total): 256 MB

Vendor: NVIDIA (0x10de)

Device ID: 0x0863

Revision ID: 0x00b1

ROM Revision: 3385

Displays:

Color LCD:

Resolution: 1152 x 720

Pixel Depth: 32-Bit Color (ARGB8888)

Main Display: Yes

Mirror: Off

Online: Yes

Built-In: Yes

Display Connector:

Status: No Display Connected

Thoughts anyone?

If anything were to go wrong, how easy is it to go back? Is there a way to easily restore my computer back to how it is now?

Any advice much aprecated!

Thank you very much in advance,

BertieTBE