Please refer to my main review and other Q&A posts on this site.
First and foremost, if you don't know much about Echuca and country living, you will need to spend a few months living in Echuca to see if the lifestyle suits you. You could try an O.T.C. deal with a motel to get a discount.
However, Echuca like many country/regional places, have high crime rates. Don't be swept of your feet about the tranquility of the Murray River (when it is not in flood mode). If you are relocating from a "big smoke", you will miss a lot of its convenient "creature comforts". If you want to move to Echuca, you really should have at least one very good reason for doing so - a well paying job in the multiple 6 digits, an intimate or something profound. There aren't many things to do in Echuca, like most country areas, and you could end up being bored and with a feeling of isolation. You may get a buzz in the first 6 months but like any move, the novelty will wear off. Think very carefully about a river/tree change and ensure that you won't close any doors behind you if you decide to bail out.
The Southern 80, Steam rally and other things are popular attractions but you will probably find yourself traveling to other towns to change the scenery.
Echuca has enough shops for everyday living, but you will find yourself traveling to Shepparton and even Bendigo for more specialised requirements. That is a pain in the proverbial, but that is one aspect of country living that you will need to adapt to, if you aren't acquainted with the country.
If you like hot summers, you will love Echuca but UV radiation is higher than southern Victoria. Summers are not all the same but when you cop a hot and relentless summer, expect about 10-14 days averaging 40°C. Winters are quite cold also.
In summing up, I can only say "be aware and take care".