It is not difficult to buy washing machine parts; however, it may be a little more difficult to pull that machine down and find out exactly what part is broken. If you are a true handyman, then this may not be anything to worry about, but for those who are not used to anything mechanical then it could pose a problem. The best thing to do is to get that repairman in to do the job and tell you what is needed.
When you go to buy anything online you have to make sure you choose a reputable site and one that has a return policy, just in case the goods you buy are not right. You will need to look for signs that your chosen online store is safe and secure with the payment pages encrypting your payment details. Look for the URL starting https; the s on the end means it is secure. Another way to tell is the padlock symbol on the bottom right of the page. And don't forget to read all the terms and conditions first.