SAP - Installation

Here are some document links where you can get the step by step instructions for SAP Installation. Also, check the Video Tutorial Link that shows the step by step process.
Follow any one of the guides that is easy and helpful for you.

SAP - Installation Guide (1)

Installation SAP 4.7 on Windows 2003 - Part 1
Installation SAP 4.7 on Windows 2003 - Part 2

Install SAPGUI 6.2 - Desktop

SAP - Installation Guide (2)

SAP 4.7 Installation Guide

SAP - Installation Guide (3)

SAP 4.7

SAP - Installation Guide (4)

SAP4.7 Complete

SAP -Installation Video Guide:

Download and extract and if you have flash player installed you can double-click to play or you can use Internet Explorer or Firefox to open this video.

SAP IDES Installation Video Tutorial Link1
or
SAP IDES Installation Video Tutorial Link2


SAP Post Installatiion Steps:

Post installation

You can find the major SAP Trial version softwares from the below Public SAP FTP site:

SAP GUI 7.10 for Windows

Patches

SAP GUI 6.40 for Windows

Patches

SAP - Installation