Firstly and importantly, investing in Bitcoin isn't hard especially if you want to HODL, it's a very simple thing that will only require your patience to be able to stay long until profit is realized. Buy Bitcoin aswell isn't difficult, there are many platforms out there who offers the service of sales of Bitcoin, they range from exchanges to Bitcoin trading platforms..
That's the easy investment option if you're patient all you have to do is to HODL but you'll still have to have money in your hand to buy bitcoin in the beginning.
Success in Bitcoin investment is relative as you determine how much of success you want to achieve by been patient enough to wait till your expected profit is realized in bit coin. If you can be patient to wait awhile further after purchase and not rush to sell because price surged up and you take a prematured profit , or probably price went down below the price at which you bought then you are not patient enough for price to come up again. Your success is very much dependent on patient.
There's another point if success in bitcoin investment's relative to how much you're investing. Today you're going to have to pay $35k if you want to buy bitcoin. How many ppl have enough to spare so they're able to buy a full bitcoin? If you're buying $100 you won't make sized profit even if you didn't sell for 2 years.