When you buy your supplies, you will usually have detailed manufacturer's instructions to explain how to install replacement window, which are a step-by-step guide with all the details you need to know. Choosing DIY to install replacement windows doesn't need to be terribly hard, but get familiar with the steps to take before you begin.

1. Measure your old window without the frame; from jamb to jamb and from sill to top.

2. Check the durability of your window framing to ensure it is not rotten.

3. Remove the old window stops and lay them aside to reuse. Take out all the old window sashes and scrape off the old caulk and nails.

4. Squeeze a layer of caulk along the window edge and sill.

5. Center the window into the frame on the caulk.

6. Replace the interior stops, and caulk where they connect to the window frame.

How to Find Good Contractors For Your Replacement Window Installation

If replacement window installation is too difficult for you or you would prefer the peace of mind of having a professional handle it, know what to look for when hiring experts.

1. Do your research beforehand to know what kind of windows you want and what budget you have for them. This will dissuade anyone from trying to sell you more expensive items.

2. Get recommendations or referrals for at least 3 or 4 different handymen, and check into their reputation and credentials.

3. Have them come to your home to give you free estimates on the work. Have them also give you an estimate on how long it will take. Get it all in writing.

4. Find out their warranty on the products (if they are providing them) or on the service.

5. Confirm the payment options. You can often pay in 3 installments: upon signing the contract, when the work begins and at the end of the job.

The more information you get before you start calling people, the more informed you will be about your decisions, making negotiations go much smoother with the contractors. If you can't install replacement window, at least be prepared to find the best professionals.